As I mentioned at the conclusion of the original review, I liked it enough that I decided to buy it, and then take things a step further. It’s also rated for rounds up to the .300 Winchester Magnum, so it won’t have issues with higher-pressure 300 Blackout loads. WEIGHT- 5.1 lbs; SIG Sauer MCX Rattler Pistol – Ammunition. With all the weight of the Rattler closer to your body, you seemingly don’t even notice it while shooting the weapon. It opened up at about 3 … SIG specifications for the weight of the trigger pull are five to nine pounds (2.27 to 4.08 kg). Compare prices for SIG SAUER SIGMCX Rattler 300 AAC Blackout 798681581306 from all vendors . Built for elite military units, the Sig Sauer MCX Rattler and its sub-6-inch barrel is billed as the 'world's most compact rifle.'. Another design goal was optimized sound suppressor use, so sub- and supersonic 300 Blackout loads were developed. I love how SIG always puts QD mounting points in all of their rifles and pistols. However, any Rattle barrel can be swapped with other Rattlers. The Rattler, a compact personal defense weapon built at the request of “elite military units,” is based on the Sig Sauer’s popular line of MCX gas-operated piston AR-15-style rifles. Scroll through the gallery above and be sure to watch the quick video below to see the MCX Rattler in action. Sig created the Rattler to take advantage of the ballistics of the 300 Blackout cartridge. Surrounding the barrel and piston system is a 5-inch, free-floating M-LOK handguard. This Rattler is equipped with free floating M-LOK Handguard and side-folding Pivoting Contour Brace (PCB). And when the special operations community began searching for a new 300 Blackout PDW, Sig Sauer provided a solution with the SIG MCX Rattler. I was able to get 10 hits out of 10 on the top portion of an IPSC silhouette at 100 yards with the Lehigh Defense load and Barnes subsonics—well within the design’s parameters. If you need a discreet weapon for 100-yard engagements, it’s perfect. I have read the Terms of Use, Privacy Policy, and Cookie Policy, and I hereby agree to those terms. I live half an hour outside of town on my modest rural farm. These guns eventually faded away—partially because of their ammunition and because it was easier to use a variant of the M4 Carbine—but the need did not. Accuracy was excellent at 50 yards on 4-inch round plates. Designed to offer better ballistic performance than a submachine gun, but from a smaller package, it features a two-position gas regulator for use with a suppressor, full-length M1919 top rail, and free-floating handguard. Follow me on Instagram for daily content: https://www.instagram.com/arm.and.gun/ Video on disassembly and reassembly of the Sig MCX Rattler in 300blk. You’ll probably need hearing protection with sub- and supersonic ammo. Anything beyond 100 yards and that starts to fade. Weight: 5.2 pounds; Height: 5.6 inches; MSRP: $799; Blackbird Armament Bantam. The MCX can be switched from 5.56mm NATO to 300 Blackout and back again, and users can easily install new barrels, handguards and stocks as needed. It’s not cross-compatible with other rifles in the MCX or Vitrus series. The new SIG MCX Rattler PCB 300 Blackout pistol with 5.5 inch PDW threaded barrel, it’s SIG Sauer’s newest edition in the MCX Pistol lineup. This short barrel has a 1-in-5-inch twist rate optimized for heavy bullets, and it’s paired with an adjustable gas block so you can run the gun with a suppressor, for example. I have read the Terms of Use, Privacy Policy, and Cookie Policy, and I hereby agree to those terms. SIG Sauer MCX Rattler with collapsing pistol brace and SIG Sauer SRD762QD-Ti silencer. “Built for top-tier units, the short-stroke piston design eliminates the bugger tube, yet maintains familiar M4 controls,” according to Sig. Firearms Free, Ammo/Access. Its stock provides access to all controls. Reporting for Duty: Sig’s P320 RX Full-Size 9mm Pistol, Sig’s Matchmaker: The 1911 Match Elite Stainless, Navy Ship Collides with Tanker: Sailors Missing, Remains Found. Before we get there, let’s look at the concept of the personal-defense weapon (PDW). The bottom line? During the initial review of the SIG Rattler Canebrake, I ended up liking the firearm more than I initially thought I would. First of all, the gun packs a huge punch for a very small package. I would use the 110-grain Barnes TAC-TX load and never feel undergunned. map. But if you want range, get a longer-barreled rifle with a slower twist rate to optimize 125-grain loads. Sig offers several variants, including pistols with stabilizing braces. This gun was designed from the ground up to be as discrete as possible while retaining all the robust capabilities of the … It will likely go through a threat up close (given no contact with bone), but most of its work is done before exiting. Direkte Gesellschafterin des Unternehmens ist die SIG Sauer Verwaltungs GmbH mit Sitz in Emsdetten. SIG SAUER 300 BLK Elite HT 120gr. RELATED STORY: Reporting for Duty: Sig’s P320 RX Full-Size 9mm Pistol. Although I didn’t measure the trigger pull weight … Sig Sauer MCX Rattler PCB 5.56 NATO AR Pistol - PMCX-5B-TAP - $2299.99 Details - Caliber: .223 Remington / 5.56 NATO - Operating System: Gas Piston - Action: Semi-Auto - Finish: Black Nitride - Handguard: M-Lok - Sights: None - Brace: SIG PCB Side Folding Fixed Brace - Trigger: SIG Both suppressors were more effective than, say, a flash suppressor or muzzle brake, but don’t expect the gun to be as quiet as those shown in the movies. The SIG MCX Rattler is an incredibly handy rifle that’s easy to conceal. SIG SAUER 300BLK 220gr. To keep my support hand from creeping up on the muzzle, I added an M-LOK-compatible Kinesthetic Angled Grip (KAG) from Bravo Company Manufacturing (BCM) to the forend. Will it perform at greater distances? Weight w/ Magazine: 5 lbs., 2 ozs. Tactical Life Gun Magazine: Gun News and Gun Reviews, Click to share on Facebook (Opens in new window), Click to share on Twitter (Opens in new window), Click to share on Pinterest (Opens in new window), Click to email this to a friend (Opens in new window), Stoeger M3500 Snow Goose: Purpose-Built Shotgun for Extreme Hunters, Franchi Affinity Turkey Elite: Hunt-Ready 12- and 20-Gauge Shotguns, Sector Optics G1T2: The Do-It-All Scope You’ve Never Heard Of, Streamlight TLR-10: Rail-Mounted Weapon Light Pushes 1,000 Lumens, Night Vision 101: The Pros and Cons of Single-Tube vs Multi-Tube NODs, Stay Ready With the High Speed Gear Compact ReVive Medical Pouch, Defense Department, HHS Purchase 100 Million COVID-19 Vaccines, WATCH: Vegas Police, Gun Range Workers Fatally Shoot Suspect, Kelsey DeSantis: The Marine Vet, MMA Fighter, and All-Around Badass, WATCH: Bay Area Officer Puts Down Armed Felon Who Goes for Gun, WATCH: Gas-Soaked, Barricaded Suspect Throws Molotov Cocktail at Police, WATCH: Range Time With the Primary Arms GLx 2.5-10×44 FFP Scope. What distinguishes the .300 BLK is its ability to access standard supersonic rounds … It was a handful and some serious fun! https://www.tactical-life.com/firearms/rifles/first-look-sig-sauer-mcx-rattler To order a copy and subscribe, visit outdoorgroupstore.com. Eventually, ammo manufacturers answered the call, and now dozens offer 300 Blackout loads for a variety of uses. Due to scammers and spammers, you must now Login to use the contact form. The recoil was manageable with the hottest loads, and it was a pleasure to shoot with subsonics. I love the TBAC Ultra 5 as a K-can but concerned about using it in this uber … Jones’ .300 Whisper wildcat cartridge and developed the SAAMI-standardized 300 Blackout. Compact and lightweight, the SIG Rattler for sale is the solution for a wide array of shooting scenarios. Can the SIG MCX Rattler do it? Units specializing in covert, ship-borne or hostage-rescue operations still wanted PDWs with more power—rifle-caliber power to be exact. I'm thinking of changing out the stock for a folding tail-hook to reduce the weight. It’s a solid little gun built like a tank, but it’s not a bad weight at all. On top of the list is the short barrel of the SBR. This is the SIG MCX® Rattler. Some full-auto time using 125 grain FMJ full power ammunition quickly explained the “rattler” moniker. This is a steal! No, but it was never designed to be. A proprietary gas block allows use in 300 BLK suppressed and unsuppressed, with both super and subsonic ammunition. A 5.56mm version will be available for unsuppressed fire only. This round was designed to offer terminal ballistics similar to the AK’s 7.62x39mm while still being compatible with AR-style rifles, requiring only a barrel change. To test the SIG MCX Rattler SBR as it might be used on a deployment, I added a few accessories. Geschäftsführer sind Franz von Stauffenberg, Tim Castagne und Till Hake. I didn’t find the latter to be the case. Get a quick look at the MCX Rattler on the SIG range in this video, and for more, visit sigsauer.com. With the MCX Rattler Canebrake there’s no need for … Setting up a Sig Rattler for trunk / backpack gun duty. Like the MPX, the MCX uses a short-stroke gas piston system, which does away with the need for a buffer system, and the weapon can use a folding stock or no stock at all. Live Inventory Search. It’s chambered in 300 Blackout as well with a 5.5-inch barrel. So, as you can see, this is the ultimate platform for a protective detail, SWAT operations where concealability is paramount, or vehicle or home defense with responsible citizens. Probably, but not at 900 fps. We recently got some exclusive test time with Sig Sauer’s latest rifle: The MCX Rattler. Subsonic; American Eagle 300 Blackout 150gr; Gorilla Ammunition TROOP Remanufactured 300 BLK 147gr FMJ; Defender Ammunition Company 300 BLK factory reman 150gr FMJ ; G2 … It’s truly impressive. Is the Rattler a precision instrument? The overall length is around 16 inches from muzzle to the end of the brace. For more information on the SIG MCX Rattler, please visit SigSauer.com. IN THIS ARTICLE. Sorry, your blog cannot share posts by email. The SIG Rattler is something special. It instills more confidence than any handgun round or .22-caliber (or smaller) bullet typical of most PDWs when having to put down an opponent in close quarters, at distance or behind a barrier (such as a vehicle). Instead, it’s plenty accurate for its intended purpose. Hornady’s 110-grain V-MAX bullet penetrated 26 inches and retained 88.7 grains of its original bullet weight. *Bullet weight measured in grains, velocity in fps by chronograph and accuracy in inches for best 5-shot groups at 50 yards. What sets the SIG MCX Rattler apart? Mar 22, 2018, Stay in the know with the latest from the Tactical-Life newsletter, Walther PDP Full Size: New 18+1 Capacity Pistol Built to Use Red Dot, CZ Scorpion EVO 3 S2: The Discreet, Civilian-Ready 9mm Micro Pistol, SIG P320 MAX: Sig Sauer Unveils 22-Round Pistol Inspired by Max Michel, Jeff Quinn Memorial GP100: Ruger Honors Late Gunblast.com Creator, Tactical Life Gun Magazine: Gun news, gun reviews and gun magazines for gun enthusiasts, military and law enforcement, You use of this website constitutes and manifests your acceptance of our. The machining and attention to detail with the SIG MCX Rattler SBR is immaculate. The MCX Rattler Canebrake comes as a suppressor ready platform with an SD handguard and inert training device that mimics the size and weight of the SIGSRD762 suppressor and assure all muzzle flash is past the shooters hand when reaching out on the handguard during operation without a functional suppressor installed. Most 5.56 NATO rounds vary between 50 grains, up to 80 grains in bullet weight. SIG Sauer SIG MCX Rattler SIG … The Eberlestock bag worked well with the gun sporting a suppressor and fully loaded, and removing the can and ammunition would allow the Rattler to slide into a small laptop case. Using the Lehigh Defense ammunition, it’s a 50-yard rifle. Sorry, your blog cannot share posts by email. Looking for a K-can setup to just take the edge off. It is one of, if not the shortest, AR platform rifles available to date with a sub-6-inch barrel. That’s pretty much what you’d expect from a V-MAX. FREE GUN FRIDAY: Win a SIG Sauer Pistol and 9mm Ammo! Aug 22, 2017, Stay in the know with the latest from the Tactical-Life newsletter, Walther PDP Full Size: New 18+1 Capacity Pistol Built to Use Red Dot, CZ Scorpion EVO 3 S2: The Discreet, Civilian-Ready 9mm Micro Pistol, SIG P320 MAX: Sig Sauer Unveils 22-Round Pistol Inspired by Max Michel, Jeff Quinn Memorial GP100: Ruger Honors Late Gunblast.com Creator, Tactical Life Gun Magazine: Gun news, gun reviews and gun magazines for gun enthusiasts, military and law enforcement, You use of this website constitutes and manifests your acceptance of our. But it’s really a 100-yard rifle with supersonic ammunition. With all the weight of the Rattler closer to your body, you seemingly don’t even notice it while shooting the weapon. The strict new policy for YouTube gun content bans videos that link to sites... by Personal Defense World / Weight: 7.4 lbs. The Sig Rattler was developed to replace military style personal defense weapons that shoot pistol calibers. SIG SAUER MCX Rattler Caliber: .300 BLK Weight: 6 pounds, 1 ounce Length collapsed: 19.2 inches Length extended: 23.6 inches Barrel length: 5.5 inches with a 1:5 twist Action: Adjustable gas piston Handguard: 5-inch M-LOK For purposes of clarity, I consent to Athlon's collection, storage, processing, and transfer of my Personal Data and Non-Personal Data (as defined in the Privacy Policy) for the purpose of signing up for the email newsletter. Now that we have gotten the weight and appearance … The barrel is only 5.5 inches long—something unthinkable with a direct-impingement AR. For purposes of clarity, I consent to Athlon's collection, storage, processing, and transfer of my Personal Data and Non-Personal Data (as defined in the Privacy Policy) for the purpose of signing up for the email newsletter. The Rattler is one of the best PDWs currently on the market, with a tiny footprint and rifle cartridge power, the Sig Rattler … I wanted to see if the bullets would expand at close range given their lower velocities. To carry the Rattler discreetly, I used Eberlestock’s Combat Office Brief, which represents a typical messenger bag, as well as several other covert packs in my inventory, including some camera bags. Swapped it out for a Romeo 3. Both short-barreled rifle (SBR) and pistol variants of the MCX Rattler are available. In this episode of TFBTV, James Reeves reviews the SIG MCX Rattler, a 5.5" PDW in .300BLK that has been purchased for US SOCOM evaluation. This is a 100-yard rifle. Weight 5.1 lbs Sig Rattler Details: The Sig Sauer Inc, MCX Rattler .300 Blackout (.300AAC)is considerably shorter than the Sig Virtus the Rattler’s 5.5” barrel makes it extremely concealable (it’s even smaller than the Q Honey Badger), this model comes equipped with the Side Folding Sig Brace. Each block of calibrated Clear Ballistics gel measured 4 by 4 by 17 inches. The MCX platform on which the Rattler … Would I want to get shot with it at 200 yards? 2) the locking tab on teh qd lever will not stay locked. It’s perfect for indoor situations where 25 yards is a long shot and overpenetration is a concern. It was ok … I got my hands on the SBR variant, which features a skeletonized stock that folds flat against the left side of the receiver without obstructing the controls. I used two suppressors with the Rattler. As good as SIG Sauer marketing and advertising is at getting the word out on new products and their applications, I wanted to put together a comprehensive user-level guide for MCX rifle and pistol functionality, maintenance, upgrades and field uses. At the range, my first order of business was zeroing the Rattler and shooting five-shot groups with it at 50 yards using loads from Barnes, Hornady, Lehigh Defense and Sig. Anybody know what the stock weight of the Rattler PSB is? That never occurred with the Dead Air Sandman-K, but the Rattler never missed a beat with either and ejected every case as fast as could I pull the trigger. At 1,900 fps, you’ll still get a good permanent wound cavity, some temporary cavity and the ability to defeat armor in most cases. The Barnes 110-grain TAC-TX had fully expanded by 7 inches, leaving a perfectly mushroomed bullet weighing 108 grains at 26 inches. Blackbird Armament is a relatively new player in the scene, but already has a number of solid offerings; tops on the list for us is the Bantam. Want to see your products here? No. Pair that with the consistent black nitride finish, and there’s nothing to complain about with the appearance of this firearm. However, moving to the Barnes, Hornady and Lehigh Defense rounds changed things. It’s so small you barely know it’s there, and it’s also rated for sub- and supersonic loads. The idea was to replace 9mm submachine guns for support troops and special operations units with something more powerful that wasn’t a full-sized rifle. A US Navy Ship, the USS John S. McCain, has collided with a commercial... by Tactical-Life / Sure, but that’s not its sweet spot. For more on the Rattler and other products from Sig, please visit SigSauer.com. With the stock folded, the gun is only 16 inches long, making it the shortest 300 Blackout weapon on the market. Now that we have gotten the weight and … The SIG Rattler is a short-stroke, piston-driven semiauto, feeding from familiar STANAG-pattern box magazines. I would deploy this as a dedicated entry rifle in a heartbeat. Pair that with the consistent black nitride finish, and there’s nothing to complain about with the appearance of this firearm. Gun Zone Deals. It opened up at about 3 inches and penetrated 12.7 inches, retaining 192.8 grains of its original bullet weight. I like the size and weight, but two problems. Kind of big and heavier than I wanted. The 300 … Thanks to the currently short eforms form 1 wait times, I was able to get my rattler registered as an SBR in less than a … Designed as a compact close quarters rifle, it packs a punch. I have read differing reports about the trigger, with some users reporting rough, heavy triggers on the Rattler. But no Sig Sauer MCX Rattler review, or a review of MCX Rattler 300 BLK for that matter, will be complete without talking about its compatibility with other similar weapons. 1) the tab on the battery tray broke off. Of course, given the Rattler’s short barrel, some gel testing was in order. To activate it from either side of the gun, I mounted its tape switch on the Rattler’s Picatinny top rail. Share … The SIG Rattler’s .300 BLK chambering allows for a multitude of missions. Boasting speed, stealth and a folded stock length of only 16 inches, the SIG MCX Rattler Canebreak is the shortest 300 Blackout weapon on the market. The machining and attention to detail with the SIG MCX Rattler SBR is immaculate. This highly maneuverable 30-round 5.56 NATO or 300 Blackout pistol has a streamlined, thin, foldable stock for concealment and storage, and features a gas piston operating system, a free-floating M-LOK handguard, and a 5.5-inch cold hammer-forged carbon steel … This lead to some interesting designs that used proprietary cartridges, like the 5.7x28mm FN P90 and 4.6x30mm HK MP7. My other SBR's, which are all setup with significantly longer barrels, are running TBAC Ultra cans. The MCX Rattler Canebrake comes as a suppressor-ready platform with an SD handguard and inert training device that mimics the size and weight of the SIGSRD762 suppressor and assure all muzzle flash is past the shooters hand when reaching out on the handguard during operation without a functional suppressor installed. The 194-grain Lehigh Defense ME bullet was the only subsonic to expand. The heavier 120- to 125-grain loads performed similarly. In one … Like the SIG Rattler, the Blackbird Bantam is available as a pistol or SBR (pictured). Sig Sauer has really redefined the word “versatility” with the MCX and MPX, and it doesn’t get much better than the Rattler in close quarters. Ready to go wherever it’s needed, the MCX Rattler PSB features a 3-position telescoping pistol brace for stability and easy concealment. The MCX operating system allows firing while folded. As the MCX Rattler is only available in the .300 Blackout caliber, only time will tell for if SIG will one day offer it … With the MCX Rattler Canebrake there’s no need for … A few times the bolt wouldn’t lock back after firing the last round with the SilencerCo Omega 9K in place. Available as an SBR, it will be available as an upper for any MCX lower. SIG’s PCB folding brace makes it even more easy to conceal, in you favorite bag or brief case. Suppressed, the Rattler ran everything on the supersonic setting (less gas). This article on the SIG MCX Rattler is from the May/June 2018 issue of “Tactical Life” magazine. The trigger on the MCX Rattler SBR that I was provided with for evaluation was quite good. It’s very handy. The gun weighs just over 5 pounds without optics. The first was the SilencerCo Omega 9K, which is only 4.7 inches long and weighs 7.2 ounces. RELATED STORY: Sig’s Matchmaker: The 1911 Match Elite Stainless. Tactical Life Gun Magazine: Gun News and Gun Reviews, Click to share on Facebook (Opens in new window), Click to share on Twitter (Opens in new window), Click to share on Pinterest (Opens in new window), Click to email this to a friend (Opens in new window), Stoeger M3500 Snow Goose: Purpose-Built Shotgun for Extreme Hunters, Franchi Affinity Turkey Elite: Hunt-Ready 12- and 20-Gauge Shotguns, Sector Optics G1T2: The Do-It-All Scope You’ve Never Heard Of, Streamlight TLR-10: Rail-Mounted Weapon Light Pushes 1,000 Lumens, Night Vision 101: The Pros and Cons of Single-Tube vs Multi-Tube NODs, Stay Ready With the High Speed Gear Compact ReVive Medical Pouch, Defense Department, HHS Purchase 100 Million COVID-19 Vaccines, WATCH: Vegas Police, Gun Range Workers Fatally Shoot Suspect, Kelsey DeSantis: The Marine Vet, MMA Fighter, and All-Around Badass, WATCH: Bay Area Officer Puts Down Armed Felon Who Goes for Gun, WATCH: Gas-Soaked, Barricaded Suspect Throws Molotov Cocktail at Police, WATCH: Range Time With the Primary Arms GLx 2.5-10×44 FFP Scope. Have a deltapoint pro for it and Omega9k. Introduced in 2015, the MCX is essentially a larger, rifle-caliber version of Sig Sauer’s pistol-caliber MPX. One: Factory New August 2020 Manufacture Date (See Box Label) Sig Sauer MCX Rattler .300BLK Pistol & Discreet Carry Package+ Mags+ carry bag! Store Price Shipping rate Show more; Out Of Stock. For targeting, I installed a set of Daniel Defense’s fixed sights, as well as a Sig Sauer ROMEO3 reflex sight in a tall mount for co-witnessing. Barnes’ 110-grain TAC-TX ammo was the most consistently accurate of the supersonics, with a group right at 0.75 inches. The mou… Meanwhile, Rattler … Every MCX also comes with an ambidextrous safety selector and magazine release for righties and lefties. Standard 5.5" barrel and using 110gr TAC-TX supers. The Barnes 110-grain TAC-TX had fully expanded by 7 inches, leaving a perfectly mushroomed bullet weighing 108 grains at 26 inches. Post was not sent - check your email addresses! Click this link. $2,008.49. Starting in 2009, Advanced Armament Corporation (AAC), in cooperation with Remington Defense, took J.D. The ammunition we utilized in testing the SIG 300. Like always the SIG Rattler PCB is … Flat $11.99: … I fired the Rattler off-hand from 10 and 15 yards with the earlier test loads and a few others, including Winchester’s 150-grain Deer Season XP ammunition and Nosler’s 220-grain BTs. It began in earnest in the late 1980s. Two of the loads were subsonic; Sig’s 220-grain OTMs clustered into 0.7 inches while Lehigh Defense’s 194-grain Maximum Expansion (ME) rounds created a 1-inch group. $8.95 - $24.95 And $10 For Additional: details: Mr Gun Dealer. Featuring a 5.5″ PDW barrel, the MCX platform has never been more compact or accessible. And I also used a LaRue Tactical offset mount to install a SureFire M312 Vampire Scout, which produces white and IR light. FREE GUN FRIDAY: Win a SIG Sauer Pistol and 9mm Ammo! The 194-grain Lehigh Defense ME bullet was the only subsonic to expand. It started expanding at about 6 inches and fragmented at 15, leaving just the lead core and base at 26 inches. I count the local Sheriff and his deputies among my dearest friends, but even in a perfect world it will still take them at least a quarter hour to get to my place from a standing start. The second can was the Dead Air Sandman-K, which is slightly heavier at 12.8 ounces yet only 0.7 inches longer. It uses a specialized upper receiver that is designed to be as compact as possible. Post was not sent - check your email addresses! Despite the unique internals, the MCX’s controls are similar to a standard AR’s, which helps because most shooters are familiar with the latter’s manual of arms. YouTube Gun Content: Video Platform Cracks Down on Firearms. That said, neither of the suppressors was really quiet. I put a ton of ammunition through this rifle, and everything worked—typical of the MCX series. I know of three of my immediate neighbors who have been the victims of home invasions in the past five years, two of which occurred while the homes were occupied. Couple questions and seeking recs: 1. The system is also completely modular like the MPX. These two hunting loads made perfect little holes and passed through their blocks without expanding. Das Unternehmen ist Teil der durch die L & O Holding angeführten SIG Sauer-Gruppe. Spending time on the range with the MCX Rattler, mine was tested with both super and subsonic loads unsuppressed and it ran everything well. I had a Vortex Spitfire for a while. Says about 5.1lbs on the sig website, which I would love, but i can't see it being true because the Rattler SBR is supposed to be 5.7lbs, mixed numbers im guessing. This cartridge utilizes the same case length as 5.56, but packs a much bigger bullet. 3 Position Telescoping PSB.