Sig rattler 300blk upper

Aero Enhanced slick side, a Resurgence Arms CF HG with a 8.3 Hanson barrel. Super lightweight upper, even with an R9 on it. Bravo uppers are mint. My 9” bcm in 300 blk is my favorite AR to shoot by far. DDM4 300S, swapped DDM4 rail with MK18 RIS2 rail. Sig MCX Rattler upper conversion kit. I'd go with 1-7.

Aug 18, 2023 ... ... SIG MCX® Rattler. Featuring a 5.5″ PDW barrel, the MCX platform has never been more compact or accessible. Ready to go wherever it's needed ...NEW SIG Sauer MCX-RATTLER LT 6.75″ 300BLK Upper Assembly. With the new SIG Sauer MCX-RATTLER LT 6.75″ Upper Assembly, you can now convert any M4/AR15 platform into the ultimate suppressor-ready MCX-RATTLER LT style firearm your heart desires. The MSRP is a hefty $1,799, but that is still cheaper than a complete MCX …Introducing the Sig Sauer MCX Rattler SBR 300 Blackout, a semi-automatic short-barreled rifle designed for rapid deployment, maximum agility, and unparalleled accuracy. This compact firearm is perfect for operators on the move, featuring a foldable stock and a 5.5-inch PDW barrel for easy concealment and stowage.Sig Sauer SIG MCX Rattler Upper 300 Blackout Includes 5.5" Barrel M-Lok Handguard Side Folding AR Buffer Tube Knuckler Includes Charging Handle Bolt Carrier Sig Duo Matchlite... Out of stock . Quick view. Sig Sauer - MCX Rattler SBR 300 Blackout 5.5" - 30rd* Sig Sauer. MSRP: $2,979 ...Sig Sauer MCX-Rattler LT 300 AAC Blackout 6.75in Black Modern Sporting Pistol - 30+1 Rounds - All of the breakthrough features of the original MCX-Rattler now in a more modular, capable package. Designed to meet the needs of Special Operations forces, the MCX-Rattler LT features fully ambidextrous controls, including an ambidextrous bolt …Companies in the Consumer Goods sector have received a lot of coverage today as analysts weigh in on CarMax (KMX – Research Report), Signet Je... Companies in the Consumer Goods ...Why the SIG MCX Rattler Is the Perfect 300 Blackout PDW Solution. With the stock folded, the gun is only 16 inches long, making it the shortest 300 Blackout weapon on the market. The SIG Rattler is something special. Before we get there, let’s look at the concept of the personal-defense weapon (PDW). It began in earnest in the late …

Rapid deployment, thin, agile and precise. This is the SIG MCX Rattler. Featuring a 5.5" PDW barrel, the MCX platform has never been more compact or accessible. Ready to go wherever it's needed, the MCX Rattler PSB features a 3-position telescoping pistol brace for stability and easy concealment.Sig Sauer's Suppressed Upper Reciever (SUR) in .300Blk is a complete MCX upper with bolt and charging handle included. Compatible with MCX and MCX VIRTUS systems, this upper is also compatible with most standard M4/AR-15 lower recievers. Sporting a 9 inch 300BLK barrel with a pinned and welded titanium suppressor, this upper comes in at a ...Additional features of the MCX Rattler Canebrake include a 2-stage flat-blade match trigger, Cerakote E190 finished upper and lower, a folding coyote-tan PCB, and comes with one 30-round polymer 300blk Magpul™ magazine. MCX Rattler Canebrake: Total length: 29.5” Barrel length: 5.5” Barrel Twist: 1:5” Weight: 6lbsThe kit includes the complete upper with 5.5" .300 Blackout barrel, bolt carrier group, buffer tube eliminator / 1913 back (for mounting a brace or stock), 1913 side folding adapter (for mounting a buffer tube for brace or stock), Sig's Match Duo 2 stage trigger, and a 1913 QD adapter.A subsonic .300BLK, 190-220gr at 900-1050fps is going to have a trajectory nowhere close to a 50/200 zero. If you zero a subsonic .300BLK at 50 yards the question will be how many yards low you will be at 200 yards. The answer is about two yards low at 200 yards with a 50 yard zero. P. pxchoi Discussion starter.The MCX-SPEAR-LT features a lightened handguard, offering enhanced maneuverability without sacrificing durability. Its sleek and ergonomic design ensures a comfortable grip and optimal control, allowing for effortless handling in various shooting conditions. Whether you're on the range or engaged in tactical operations, this rifle is designed ...

Find the best deals on Sig Sauer MCX uppers in 300 BLK caliber at Midwest Gun Works, your trusted source for firearm parts and accessories.17. SIG SAUER’s adding a suppressed upper receiver to their lineup: the SUR300. The new upper — chambered in the ever-so-chic 300 blackout (300blk) — fits the SIG MCX and a standard AR15 lower. The MCX upper has some cool features: – 6.75” Cold Hammer Forged Barrel. – Permanently Attached 19 Baffle Titanium Suppressor. Sig Sauer MCX Rattler .300 Blackout AR-15 Pistol 5.5" 30rd, Black - PMCX-300B-5B-TAP-NB ... Black finished upper and lower, and comes with one 30-round polymer 300blk ... MCX Virtus 9" Caliber Exchange Kit - 300BLK. The official conversion kit for your SIG MCX Virtus. 5. (23) Availability: In Stock. Price $699.99. or 4 interest-free payments of $175.00 with. ⓘ. This is the MCX Rattler. Featuring a 5.5" PDW barrel, the MCX platform has never been more compact or accessible. Ready to go where-ever it's needed, the MCX Rattler has a thin, foldable stock for easy concealment and stowage. This gun was designed from the ground up to be as discrete as possible while retaining all the capabilities of the MCX.

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Sig Sauer MCX Rattler Complete Upper. This is the SIG MCX Rattler upper. Featuring a 5.5 PDW barrel the MCX platform has never been more compact or accessible. Ready to go wherever it's needed Convert any MIL-SPEC AR Lower into a MCX Rattler. Complete with upper assembly lower receiver stock adapter kit side folding AR buffer tube knuckler and ...Unboxing and install of my Sig Sauer Rattler 300BLK Upper Receiver Conversion Kit for AR15 lowers. Thanks for watching!My insta: https://www.instagram.com/in...Explore caliber converters from SIG SAUER today! ... MCX-RATTLER LT UPPER ASSEMBLY - 6.75" 300BLK Price $1,799.99. Add to Cart. Save Compare. on sale.This is the SIG MCX® Rattler. Featuring a 5.5" PDW barrel, the MCX platform has never been more compact or. Sig Sauer USA Firearms ... Sig Sauer MCX Rattler 300 Blackout Semi-Auto Pistol with Pistol Stabilizing Brace ... Free-floating M-LOK® handguards matched with a PDW upper and 5.5″ barrel, the MCX Rattler PSB is the ideal choice for ...Sig Sauer MCX Rattler Complete Upper. This is the SIG MCX Rattler upper. Featuring a 5.5 PDW barrel the MCX platform has never been more compact or accessible. Ready to go wherever it's needed Convert any MIL-SPEC AR Lower into a MCX Rattler. Complete with upper assembly lower receiver stock adapter kit side folding AR buffer tube knuckler and ...I have 1 sig rattler (store bought) 300 blackout 5.5" barrel, I have one "home made" MCX lower and 9" MCX upper (300 BO) and another home made MCX lower with 16" MCX upper (300 BO). I have a problem if I buy them in parts they are "less expensive" (or so I rationalize) All 3 have Romeo 5 XDR sights (SOR52102).

Save big on Sig Sauer MCX RATTLER 300BLK with NO TAX plus FAST & FREE shipping on orders over $199! Authorized stocking dealer, call (985) 269-7799 to talk to a Sig Sauer expert! ... Free-floating M-LOK handguards matched with a PDW upper and 5.5" barrel, the MCX Rattler PCB is the ideal choice for fast-moving operators. Notable Features ...Sig Sauer MCX Rattler Canebrake Semi-Automatic Pistol 300 AAC Blackout (7.62x35mm) 5.5" Barrel 30-Round Coyote Black. Cartridge: 300 AAC Blackout (7.62x35mm) You must be 18 to purchase rifles or shotguns and 21 to purchase handguns, actions or receivers. All firearms must ship to a valid FFL Dealer and cannot be changed or cancelled after they ...The Central Florida Tourism Oversight District board’s control is limited to basic infrastructure Florida’s plan to exert more control over Disney by stripping it of its special ta...My first 300 Blackout and I am SUPER HAPPY with the purchase because I already have a MCX Virtus 11.5" 556. So all I had to do was change the upper if I wanted to shoot the 300 BLK. The price was the cheapest that I found after tax and shipping. If there was a MCX Virtus 300 BLK 6.5 Upper, I would buy that as well.New, never fired Sig Rattler/Canebrake upper in 300 blackout. Had hoped to get a can some day to have a nice compact package but it won't be happening any time soon so time to free up some funds. $1300 for the upper $ 200 for the canebrake hg. Thanks for looking! Read More . Like. wandeag. Portland, OR. Messages 11 Reactions …Midwest Gun WorksShop SIG SAUER MCX 5.56 Nato Upper Receiver | 4 Star Rating on 3 Reviews for SIG SAUER MCX 5.56 Nato Upper Receiver + Free Shipping over $49. ... 300 Blackout. 300 Win Mag. 30-06 Springfield. 30-30 Winchester. 308 Winchester. 338 Lapua Magnum. 350 Legend. ... I got it for my Rattler to shoot 556, however it comes with …Sig Mcx Rattler Upper 300Blk 5.5" Manufacturer: Sig Sauer. SKU: 275918. Manufacturer part number: UAMCX-5B-300-BLK-TAP. UPC: 798681587735. Complete 5.5" upper assembly kit for your MCX Rattler in 300BLK. Convert any MIL-SPEC AR Lower into a MCX Rattler. Complete with upper assembly lower receiver stock adapter kit side …

Be the first to write a review! Complete 16" upper assembly kit for your MCX Virtus in 300BLK. Convert your AR 15 to a SIG SAUER Virtus; upper assembly, stock adapter & match duo trigger kits.

Additional features of the MCX Rattler Canebrake include a 2-stage flat-blade match trigger, Cerakote E190 finished upper and lower, and comes with one 30-round polymer 300blk Magpul™ magazine. (0 Reviews)The Sig Sauer MCX Rattler Upper Receiver boasts a 5.5-inch barrel and a polymer handguard equipped with MLOK attachment points. It also sports a full-length picatinny rail to facilitate the easy installation of sights, optics, and various accessories. What's more, this upper receiver package includes a receiver stock adapter kit, a side-folding ...Additional features of the MCX Rattler Canebrake include a 2-stage flat-blade match trigger, Cerakote E190 finished upper and lower, a folding coyote-tan PCB, and comes with one 30-round polymer 300blk Magpul™ magazine. MCX Rattler Canebrake. Total length: 29.5” Barrel length: 5.5” Barrel Twist: 1:5” Weight: 6lbsWindows only: Freeware program Calgoo offers desktop integration with your Google Calendar, meaning, most significantly, that you don't need to be online to view or schedule upcomi...Nov 19, 2023 ... ... Barrel Length- 23:14 Form 1 SBR?- 24:14 300 BLK VS 5.56 NATO- 25:31 System Overall Weight- 27:01 The MCX as a 300 BLK Host- 28:47 Gas System ...The 300 Blackout round (and ultimately the Rattler) was born out of a need by SOCOM for a compact rifle to replace the MP5-SD and other similar pistol caliber sub guns. The 300 Blackout became a viable replacement as it uses the more potent .30 caliber projectile, with subsonic capabilities like that of the MP5-SD.1 out of 6 models SIG SAUER MCX Rattler Upper Receiver Assembly, .300 BLK, M-LOK — Caliber: .300 AAC Blackout, Barrel Length: 5.5 in, Gas System Length: Carbine Length Toll-Free: +1-800-504-5897 Live Chat Help Center Check Order StatusWhether for professional use, competitive shooting, or personal defense, this rifle offers an exceptional shooting experience you can rely on. Experience the evolution of excellence with the MCX-SPEAR-LT. SIG MCX-SPEAR LT FEATURES: Lightweight Ergonomic Handguard. SIG Flatblade Match Trigger. Fully Ambidextrous Controls. Interchangeable …

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This is the MCX Rattler. Featuring a 5.5" PDW barrel, the MCX platform has never been more compact or accessible. Ready to go where-ever it's needed, the MCX Rattler has a thin, foldable stock for easy concealment and stowage. This gun was designed from the ground up to be as discrete as possible while retaining all the capabilities of the MCX.Sig Sauer MCX Rattler Canebrake Semi-Automatic Pistol 300 AAC Blackout (7.62x35mm) 5.5" Barrel 30-Round Coyote Black. Cartridge: 300 AAC Blackout (7.62x35mm) You must be 18 to purchase rifles or shotguns and 21 to purchase handguns, actions or receivers. All firearms must ship to a valid FFL Dealer and cannot be changed or cancelled after they ...Nov 19, 2023 ... ... Barrel Length- 23:14 Form 1 SBR?- 24:14 300 BLK VS 5.56 NATO- 25:31 System Overall Weight- 27:01 The MCX as a 300 BLK Host- 28:47 Gas System ...Cons. Price. Weight. If you haven’t heard of the Sig Rattler, you have certainly seen it in use or on the big screen. The Rattler is an extremely popular PDW used by well-known government agencies like the United States Secret Service and most Hollywood studios. The Rattler is a folding stock PDW chambered in 300 Blackout and …A subsonic .300BLK, 190-220gr at 900-1050fps is going to have a trajectory nowhere close to a 50/200 zero. If you zero a subsonic .300BLK at 50 yards the question will be how many yards low you will be at 200 yards. The answer is about two yards low at 200 yards with a 50 yard zero. P. pxchoi Discussion starter. The kit includes the complete upper with 5.5″ .300 Blackout barrel, bolt carrier group, buffer tube eliminator / 1913 back (for mounting a brace or stock), 1913 side folding adapter (for mounting a buffer tube for brace or stock), Sig’s Match Duo 2 stage trigger, and a 1913 QD adapter. The Rattler has a two position gas valve for running ... Sig Sauer MCX Rattler 300 Blackout Pistol with M-LOK Handguard and 5.5 Inch Barrel - $2499.99 Rapid deployment, thin, agile and precise. This is the SIG MCX Rattler. Featuring a 5.5" PDW barrel, the MCX platform has never been more compact or accessible. ... Sig Sauer MCX Rattler .300 BLK 5.5" M-LOK Upper Receiver - $1555.99 (Free Shipping …1- Sig MCX Rattler in 5.56 (conversion kit) - I already have a .300blk Rattler, so I could just buy the barrel for around $550-600 and be good to go. 2) PWS Diablo: I've had a few PWS rifles in the past and have been happy with them. ... which puts the price of the complete upper pretty close to the price of a MCX barrel. 3) Maxim PDX- … ….

RECOIL reviews the new SIG Rattler in .300 AAC Blackout. SIG Rattler A Petite MCX. ... as well as steel pins where the charging handle latches make contact on the upper receiver. The barrel is …This leaflet looks at upper left abdominal pain (left upper quadrant) and its causes (such as stomach ulcers or pancreatitis), diagnosis, and treatment. Try our Symptom Checker Got...Sig Sauer MCX Rattler .300 Blackout 5.5" Black 30+1 No Brace. Rapid deployment, thin, agile and precise. This is the SIG MCX Rattler. Featuring a 5.5" PDW barrel, the MCX platform has never been more compact or accessible. Ready to go wherever it's needed. Sig Sauer's Suppressed Upper Reciever (SUR) in .300Blk is a complete MCX upper with bolt and charging handle included. Compatible with MCX and MCX VIRTUS systems, this upper is also compatible with most standard M4/AR-15 lower recievers. Sporting a 9 inch 300BLK barrel with a pinned and welded titanium suppressor, this upper comes in at a ... Sig Sauer MCX-Rattler LT 300 AAC Blackout 6.75in Black Modern Sporting Pistol - 30+1 Rounds - All of the breakthrough features of the original MCX-Rattler now in a more modular, capable package. Designed to meet the needs of Special Operations forces, the MCX-Rattler LT features fully ambidextrous controls, including an ambidextrous bolt …These AR15 Upper Receivers crafted by SIG SAUER convert any MIL-SPEC AR Lower into an MCX Rattler with ease. Each Sig Sauer Sig MCX Upper Receiver Assembly - 5.5in 300BLK includes an upper assembly, lower receiver stock adapter kit, side folding AR buffer tube knuckler and a match duo trigger kit.The SIG Sauer MCX Rattler Upper 300 Blackout 5.5in Barrel is the perfect choice for high-performance shooting capabilities. With its 5.5 inch barrel and 300 Blackout caliber, this …Find the best deals on Sig Sauer MCX uppers in 300 BLK caliber at Midwest Gun Works, your trusted source for firearm parts and accessories. Sig rattler 300blk upper, My understandind is that Virtus is the current brand for SIG's MCX rifle. Virtus is available in pistol & rifle setups as 5.56 or 300Blk. Several barrel lengths offered with the 16" rifle called Patrol. Rattler is a specialized Virtus model with it's uniquely shorten barrel, gas system and handguard upper., This gun was designed from the ground up to be as discrete as possible while retaining all the capabilities of the MCX. Free-floating M-LOK handguards matched with a PDW upper and a PDW Ultra Thin Folding Aluminum Stock, the MCX Rattler SBR is the ideal choice for fast-moving operators. Technical Specifications: Caliber: 300BLK; Barrel Length: 5.5", And for those not sold on 300 BLK, they also make the Rattler PCB 5.56 NATO AR Pistol (PMCX-5B-TAP). Specifications: SIG Sauer Rattler SBR Operating System: Gas Piston Caliber: 300Blk …, Sig Sauer MCX Rattler LT 300 Blackout Semi-Auto Pistol with Folding Pivoting Contour Brace $2,699.99 Sig Sauer MCX Rattler 5.56 NATO Pistol with 5.5 Inch Barrel and M-LOK Handguard, Sig Rattler .300 BLK Muzzle Devices (Blast Shield) Running a rattler unsupressed, the short handguard puts your fingers in too close for comfort proximity to the factory flash hider and substantial muzzle blast. I would like to install a simple blast shield to extend the muzzle out an extra inch or so and direct the blast energy out in front of me., A study links signatures to personality, despite science debunking handwriting analysis. Learn what your sig may say about you at HowStuffWorks Now. Advertisement From hearts over ..., The Sig Sauer MCX Rattler Upper Receiver boasts a 5.5-inch barrel and a polymer handguard equipped with MLOK attachment points. It also sports a full-length picatinny rail to facilitate the easy installation of sights, optics, and various accessories. What's more, this upper receiver package includes a receiver stock adapter kit, a side-folding ... , AR Upper Receivers AR Complete Upper Assemblies 9mm AR Parts AK Products Barrels Bolt Assemblies Charging Handles ... Sig Sauer MCX Rattler LT .300Blk 6.75" SBR, Black. Write a review. $2,949.99 $2,699.99 Out of stock. as of 05/07/2024 1:06PM CST FREE PICKUP at your local RifleGear ..., The Sig Sauer 300 Blackout for sale at Omaha Outdoors delivers the accuracy, performance, and modularity you need, at a budget-friendly online price. ... SIG MCX Rattler 300 BLK Black MultiCam $3,149.99 …, The Basics. The SIG Rattler is a short-stroke, piston-driven semiauto, feeding from familiar STANAG-pattern box magazines. 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., Sig Sauer MCX Rattler Canebrake 300 Blackout Semi-Auto AR Pistol with 5.5 Inch Barrel and Cerakote E190 Finish. $2,879.99 $2,599.99. Notify Me When Available. Brand: Sig Sauer. Item Number: PMCX-300B-5B-TAP-CANE-NB. Online shopping from a great selection of discounted 300 BLACKOUT guns for sale by Sig Sauer for sale at Sportsman's Outdoor ... , Sig Sauer SIG MCX Rattler Upper 300 Blackout Includes 5.5" Barrel M-Lok Handguard Side Folding AR Buffer Tube Knuckler Includes Charging Handle Bolt Carrier Sig Duo Matchlite... Out of stock . Quick view. Sig Sauer - MCX Rattler SBR 300 Blackout 5.5" - 30rd* Sig Sauer. MSRP: $2,979 ..., 1 out of 6 models DEMO, SIG SAUER MCX Rattler Upper Receiver Assembly, .300 BLK, — Caliber: .300 AAC Blackout, Barrel Length: 5.5 in, Gas System Length: Carbine Length Toll-Free: +1-800-504-5897 Help Center Check Order Status, There are several investigations that can be performed on the upper limbs during a neurological examination. Clinical resource. Try our Symptom Checker Got any other symptoms? Try ..., Chip and Joanna Gaines of "Fixer Upper" launch a new Target collection called "Hearth & Hand with Magnolia." Our favorites are under $25. By clicking "TRY IT", I agree to recei..., Jan 25, 2023 · See all 3 models. Veteran Ammo Defense 5.56x45mm NATO 62 Grain Hollow Point Centerfire Pistol Ammo, 20 Rounds, HMBX-556-24. $49.99 (Save 19%) $40.59. $2.03 /Round. Add to Cart. 2 models. Ammo, Inc. Signature 5.56x45mm NATO, 62 Grain, SS109 Penetrator Steel Core FMJ, Brass Centerfire Rifle Ammunition. , Marmosets are some of the smallest monkeys in the world and are found primarily in the forested areas of central Brazil. And the males support their mates in a very unique way. Adv..., The 300BLK round offers the same energy as 5.56mm but with a shorter barrel (while staying quieter). In addition, 300BLK rifle upper assemblies can be paired with any AR-15 lower assembly and in most cases is compatible with 5.56mm magazines. The upgrade process is easy and can be done without the need for an armorer., The Sig Sauer 300 Blackout for sale at Omaha Outdoors delivers the accuracy, performance, and modularity you need, at a budget-friendly online price. ... SIG MCX Rattler 300 BLK Black MultiCam $3,149.99 …, There are several investigations that can be performed on the upper limbs during a neurological examination. Clinical resource. Try our Symptom Checker Got any other symptoms? Try ..., Sig Sauer's Suppressed Upper Reciever (SUR) in .300Blk is a complete MCX upper with bolt and charging handle included. Compatible with MCX and MCX VIRTUS systems, this upper is also compatible with most standard M4/AR-15 lower recievers. Sporting a 9 inch 300BLK barrel with a pinned and welded titanium suppressor, this upper comes in at a ... , Fixer-uppers offer lots of opportunities but come with some pitfalls. Fixer-uppers may typically be considered the domain of house flippers, but prospective homeowners are also get..., Introducing the Sig Sauer MCX Rattler SBR 300 Blackout, a semi-automatic short-barreled rifle designed for rapid deployment, maximum agility, and unparalleled accuracy. This compact firearm is perfect for operators on the move, featuring a foldable stock and a 5.5-inch PDW barrel for easy concealment and stowage., Cons. Price. Weight. If you haven’t heard of the Sig Rattler, you have certainly seen it in use or on the big screen. The Rattler is an extremely popular PDW used by well-known government agencies like the United States Secret Service and most Hollywood studios. The Rattler is a folding stock PDW chambered in 300 Blackout and …, Shop for official factory direct SIG SAUER Upper receivers and fully assembled uppers., The Sig Sauer MCX Rattler Upper Receiver boasts a 5.5-inch barrel and a polymer handguard equipped with MLOK attachment points. It also sports a full-length picatinny rail to facilitate the easy installation of sights, optics, and various accessories. What's more, this upper receiver package includes a receiver stock adapter kit, a side-folding ... , Chip and Joanna Gaines of "Fixer Upper" launch a new Target collection called "Hearth & Hand with Magnolia." Our favorites are under $25. By clicking "TRY IT", I agree to recei..., MCX Virtus 9" Caliber Exchange Kit - 300BLK. The official conversion kit for your SIG MCX Virtus. 5. (23) Availability: In Stock. Price $699.99. or 4 interest-free payments of $175.00 with. ⓘ. , I opted for the K for my 7.5" SBR build. Trying to build the most compact suppressed 300blk upper to stick on an M16 lower at work. Figured it'd make a perfect entry weapon. Full-auto subsonic 300 blk is fun. expensive, but fun., SIG SAUER MCX RATTLER UPPER ASSEMBLY 5.5" - 300BLK. $1,799.95. (No reviews yet) Write a Review. UPC: 798681587735. Review financing options. Stock Status: Out …, MCX Virtus 9" Caliber Exchange Kit - 300BLK. The official conversion kit for your SIG MCX Virtus. 5. (23) Availability: In Stock. Price $699.99. or 4 interest-free payments of $175.00 with. ⓘ. , Sig created the Rattler to take advantage of the ballistics of the 300 Blackout cartridge. This cartridge utilizes the same case length as 5.56, but packs a much bigger bullet. Most 5.56 NATO rounds vary …, Even with a superb SIG sound suppressor installed, the MCX Rattler is not terribly bulky. The .300 BLK chambering makes the suppressed gun surprisingly quiet. In a pinch, the device would make a superb prod should your foe end up both unarmed and recalcitrant. SIG’s electronic sights will hold their own with the best in the business.