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.

Midwest Gun WorksBuying a new home is one of the most rewarding things you can do. And then comes the work — more than you think if you've bought a "fixer-upper." Make sure you ask the right questi... Buy Sig Sauer MCX Rattler .300 BLK 5.5" M-LOK Upper Receiver UAMCX-5B-300-BLK-TAP from Scopelist - Authorized Online Dealer. Free and fast shipping over $250 + Free MVP Membership on purchases over $500. If I had to do it again, I'd just purchase a complete Virtus upper and then get the barrels that I wanted as the 5.5" Rattler barrel isn't much smaller than the 6.75" Virtus barrel. The Virtus upper allows you to use a 6.75" or 9" .300 BLk barrel as well as an 11.5" or 16" 5.56 barrel while you're limited to one size barrel with the Rattler upper.Is the Sig Rattler .300 upper conversion kit good on the AR lower, or do you guys recommend the full rattler? ... From a functional stand point they are identical. Hell the Tier 1 guys are running rattler kits on full auto M4 lowers. Reply ... I’m still testing though because 300blk is hard to find Reply

This highly configurable MCX series of Personal Defense Weapons includes machine pistol and short barrel rifle variants, compact for concealment, ...The MCX-Rattler LT also has either a cold hammer forged 6 or 7 3/4 barrel and is now fully compatible with all MCX barrels and handguards making it the ultimate modular package. Available in 300 blackout, 5.56 NATO as well as 7.62X39 calibers. 6.75in or 7.75in cold hammer forged barrel for ultra compact design. Fullly ambidextrous controls.The MCX Rattler features a dual position gas valve for suppressed and unsuppressed usage. The SIG Sauer MCX Rattler Conversion Kit includes the SIG Sauer MCX Rattler upper receiver with 5.5″ .300 BLK barrel, bolt carrier group, buffer tube eliminator/stock adapter, side folding adapter SIG Sauer Match 2 stage trigger, and QD adapter.The MCX Rattler upper receiver assembly features a standard free-floating M-LOK handguard with a top picatinny rail for sight and optic, as well as a short-stroke piston system and unique internal recoil system that eliminates the M4-style buffer tube resulting in a light-recoiling and compact platform able to be configured for any task.MCX Upper 300 Blk Assembly # - MCX Upper 300 Blk Assembly. Cart and Account. Join E-Mail List; ... Sig Sauer MCX Upper 300 Blk Assembly. Ships with: Upper, Bolt Carrier Group, Charging Handle, Taper Cap. This is ONLY the upper assembly. ... UPPER, SIGMCX, 300 BLK, 5.5 IN, RATTLER, BLK, SEMI, AL MLOK HG. Out Of Stock / Not …Most passengers won't have any idea they're boarding an almost 20-year-old plane. Virgin Atlantic operates some of the world's best business-class lounges, with a-la-carte dining, ...Update: Some offers mentioned below are no longer available. View the current offers here. It's been a big year for commercial aviation in the UK, to say the... Update: Some offers...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

November 20, 2021. 1099. 17. Unboxing and install of my Sig Sauer Rattler 300BLK Upper Receiver Conversion Kit for AR15 lowers. Thanks for watching! My insta: Note to readers: Please click the share buttons above or below. Forward this article to your email lists. Crosspost on your blog site, social media, internet forums. etc.Nothing internally needs to be changed, but both can also use different endcaps to get a closer match to the caliber you're shooting to get a few extra Db reduction. A dedicated 5.56 suppressor will perform better than a 30 cal, but is obviously less versatile if you ever wanted to shoot 6.5/300blk/.308. - Chase.Sig Sauer. MCX | 300 BLK | Rattler | 5.5" | Pistol $2,499.99. Out of Stock. SALE. Sig Sauer. Cal X-Kit | MCX | 300 BLK | 6.75" $649.99 $579.99. Out of Stock. 1 Review Hide Reviews Show Reviews 5 MCX VIRTUS | 300 BLK | 9" UPPER. Posted by ALLEN on Jan 2nd 2023 My first 300 Blackout and I am SUPER HAPPY with the …Sig Sauer MCX Rattler Upper Assembly - 5.5" 300blk. Sig Sauer. MSRP: $1,799.00 $1,699.99 Sig Sauer SIG MCX Rattler Upper 300 Blackout Includes 5.5" Barrel M-Lok ...Due to increased scam attempts within the sub, all low-flaired sellers (< 11 Trades) must follow several new procedures for increased security.THIS MEANS YOU. All items must include a handwritten timestamp with your username and the current date included in at least one picture that shows all items listed for sale to show proof of ownership. …

Park nicollet clinic minneapolis.

What is upper middle class income? What other education, home ownership and behavioral characteristics define it? Reddit users have ideas. By clicking "TRY IT", I agree to receive ...Dec 20, 2023 ... Short table top review of the Sig Sauer Rattler LT. Sig Sauer MCX Rattler .300 BLK 5.5" M-LOK Upper Receiver - $1555.99 Upper Receiver for the Sig Sauer MCX Rattler. Features a 5.5 barrel chambered in .300 Blackout, and a handguard with MLOK attachment points for the installation of lights and lasers. Upper Receiver for the Sig Sauer MCX Rattler. 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 ... The MCX / Rattler has better build quality and a quick change barrel system. It runs better dirty and is likely more reliable overall but a bit more expensive. It’s more accurate in my experience and would be my overall choice if I could only have one. It is best with a lower back pressure can. 29.

Designed for rapid deployment from concealment, the MCX Rattler packs a punch in the .300 BLK configuration. Coming in at 5.1 pounds empty, sporting a 5.5-inch barrel and folded length of 17 inches, …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.Brand: SIG SAUER. SKU: RPLSGUAMCX-5B-300-BLK-TAP. $1,799.00. or monthly payments as low as $45.62 with. ⓘ. ( No reviews yet ) Write a Review. Sig Sauer Sig Mcx Rattler Upper, 300 Blackout, 5.5" Barrel, M-lok Handguard, Black Finish, Includes Charging Handle, Carrier, Sig Duo Matchlite Trigger & 1913 Adapter To Convert …The newest iteration, the SIG MCX Rattler LT, has been highly anticipated for its groundbreaking features and performance, making it a standout in the PDW category. We’ll explore every aspect of the SIG MCX Rattler LT in this video, from its design and functionality to its performance on the range. Whether you’re a professional or a ... 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 ... 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 …November 20, 2021. 1099. 17. Unboxing and install of my Sig Sauer Rattler 300BLK Upper Receiver Conversion Kit for AR15 lowers. Thanks for watching! My insta: Note to readers: Please click the share buttons above or below. Forward this article to your email lists. Crosspost on your blog site, social media, internet forums. etc.Nov 15, 2023 · 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 airline will show what the new Upper Class seat will look like on its soon-to-be-delivered Airbus A350s. On the heels of British Airways' unveiling of its new Club Suite busine...

The latest research on Upper Respiratory Tract Infection Conditions. Expert analysis on potential benefits, dosage, side effects, and more. Upper Respiratory Tract Infection falls ... Details. The MCX Rattler Canebrake is the newest addition to the MCX family. Created for those that desire the MCX as a suppressed system, and eliminates the need to purchase additional components to do so. The Rattler Canebrake comes with a factory installed inert training device, making it operable right out of the box while NFA paperwork and ... MCX Upper 300 Blk Assembly # - MCX Upper 300 Blk Assembly. Cart and Account. Join E-Mail List; ... Sig Sauer MCX Upper 300 Blk Assembly. Ships with: Upper, Bolt Carrier Group, Charging Handle, Taper Cap. This is ONLY the upper assembly. ... UPPER, SIGMCX, 300 BLK, 5.5 IN, RATTLER, BLK, SEMI, AL MLOK HG. Out Of Stock / Not …SIG SAUER MCX Rattler Upper Receiver Assembly, .300 BLK, M-LOK Handguard, 5.5 inch, Black, UAMCX-5B-300-BLK-TAP — Caliber: .300 AAC Blackout, Barrel Length: 5.5 in, Gas System Length: Carbine …Sig Sauer MCX Rattler Canebrake .300 Blackout Coyote Brown 30+1 The MCX Rattler Canebrake is the newest addition to the MCX family. Created for those that desi ... Cerakote E190 finished upper and lower, and comes with one 30-round polymer 300blk Magpul™ magazine. Product Information: Type: Pistol: Action: Striker Fire: Caliber:If I had to do it again, I'd just purchase a complete Virtus upper and then get the barrels that I wanted as the 5.5" Rattler barrel isn't much smaller than the 6.75" Virtus barrel. The Virtus upper allows you to use a 6.75" or 9" .300 BLk barrel as well as an 11.5" or 16" 5.56 barrel while you're limited to one size barrel with the Rattler upper.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...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 …Feb 26, 2024 ... Today on TFBTV, James Reeves discusses a landmark evolution in personal defense weapons: the SIG MCX Rattler LT. This episode isn't just ...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 Status

Charlotte county accela.

One piece chapter 1101 leak.

Sig Sauer MCX Spear LT 7.62x39 Pistol 11.5" 28rd FDE - PMCX-762R-11B-LT. Regular Price $2,999.99 Special Price $2,499.99. Add to Cart. Add to Wish List Add to Compare.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 …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.Firearms...Dec 20, 2023 ... Short table top review of the Sig Sauer Rattler LT.What Are The Best 300 Blackout Pistol Options: Sig MCX Rattler. Wilson Combat Protector. Springfield Saint Victor Pistol. Ruger AR-556 Pistol. Palmetto State Armory 7.5 SBA3. Ah, the AR-pistol. Is there anything sweeter than these mighty mites? Fun as all get out to rattle off the range.Sig Sauer Upper Receiver Assembly Sig MCX Rattler 300 AAC Blackout 5.5" with Tapered Lug M-LOK Handguard Black. Product #: 477378. Manufacturer #: UAMCX-5B-300-BLK-TAP. UPC #: 798681587735. List Price: $1999.00. Our Price: $1699.99. Made in USA. Barrel Length: 5.5 Inches. 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 ... Oct 11, 2021 · Rattler has a shorter gas system on its 5.5" barrel setup. Both legacy and Virtus Carriage Assemblies have longer op rods then Rattler's. Changing this rod isn't particularly difficult, but probably isn't something you'd enjoy with every barrel change. Rattle complete upper would work, but seems expensive vs adding a 6.75" Virtus 300Blk barrel kit. 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. ….

Details. 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 match duo trigger kit. Specifications: Model: SIG …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 StatusCapital gains are realized when any capital asset, which includes most classes of personal property, are sold for a profit. While there is generally no restriction on how you may u...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 ...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.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...Capital gains are realized when any capital asset, which includes most classes of personal property, are sold for a profit. While there is generally no restriction on how you may u...Both 300 blk and 5.56 utilize the same bolt but Sig wants to ensure you pair the barrel with the right bolt, which would have tapered lugs. Earlier versions (legacy models) didn’t have tapered lugs. I doubt the muzzle device is removable. Even if it is, 5.56 tends to be threaded for 1/2x28 and the 300 blk will consist of 5/8x24 threading.The Rattler is a SIG MCX in a discrete platform. The Rattler features a 5.5" barrel with PDW upper, 3 position pistol brace, and free floating M-LOK handguard. The Rattler is ready to go where-ever it's needed as the collapsible pistol brace makes for easy concealment and stowage. Chambered in 300 Blackout, for one of the shortest … Sig rattler 300blk upper, Sig Sauer MCX Rattler Upper Assembly - 5.5" 300blk. Sig Sauer. MSRP: $1,799.00 $1,699.99. 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-SPEAR LT 11.5 AR …, 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, Sig Sauer. MCX | 300 BLK | Rattler | 5.5" | Pistol $2,499.99. Out of Stock. SALE. Sig Sauer. Cal X-Kit | MCX | 300 BLK | 6.75" $649.99 $579.99. Out of Stock. 1 Review Hide Reviews Show Reviews 5 MCX VIRTUS | 300 BLK | 9" UPPER. Posted by ALLEN on Jan 2nd 2023 My first 300 Blackout and I am SUPER HAPPY with the …, Jan 19, 2024 ... Looking for a product featured in this video? YouTube prevents us from posting links. Head over to our website to find what you're looking ..., 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., SIG SAUER Releases Special-Edition Multicam MCX-SPEAR LT; 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 ..., The airline will show what the new Upper Class seat will look like on its soon-to-be-delivered Airbus A350s. On the heels of British Airways' unveiling of its new Club Suite busine..., UPC: 798681600182 Description: SIG MCX RATTLR PST 300BLK 30RD . ... Sig Sauer MCX RATTLER PISTOL .300 Black 5.5 FOLDER BRAC - Blue/Black, 5.5" Barrel, 30+1 Rounds ... 5.5 With PDW Upper: Overall Length: 23: Weight: 5.1 lbs: Capacity: 30+1 # of Mags: 1: Safety: Ambidextrous Safety:, Sig MCX Rattler Canebrake Pistol .300 Blackout, 5.5" Barrel, No Brace, Inert Training Device, Coyote Brown, 30rd . Sig Sauer PMCX-300B-5B-TAP-CANE-NB. The MCX Rattler Canebrake is the newest addition to the MCX family. Created for those that desire the MCX as a suppressed system, and eliminates t..., 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., 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 upper offers superior accuracy and recoil management in a compact, lightweight design. The flat top design offers enhanced optics mounting options while the M-Lok ... , 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. , The MCX-RATTLER LT offers a 6.75” cold hammer forged barrel, compatibility with AR-style triggers, an adjustable gas system for suppressor optimization, a QD Clutchlok …, Sig Sauer MCX Rattler 300 AAC Blackout 5.5in Black Modern Sporting Pistol - 30+1 Rounds - Rapid deployment, thin, agile and precise. This is the SIG MCX Rattler. ... Free-floating M-LOK handguards matched with a PDW upper and 5.5in barrel, the MCX Rattler PCB is the ideal choice for fast-moving operators. Save up to $50 on your online order …, Midwest Gun Works, 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., The MCX-Rattler LT also has either a cold hammer forged 6 or 7 3/4 barrel and is now fully compatible with all MCX barrels and handguards making it the ultimate modular package. Available in 300 blackout, 5.56 NATO as well as 7.62X39 calibers. 6.75in or 7.75in cold hammer forged barrel for ultra compact design. Fullly ambidextrous controls., Analysts fell to the sidelines weighing in on Lowe’s (LOW – Research Report), Signet Jewelers (SIG – Research Report) and Whirlpool (WHR –... Analysts fell to the sidelines w..., Sig Sauer Complete Mcx Rattler Upper Assembly .300 Blackout 5" Barrel UAMCX-5B-300-BLK-TAP 798681587735. Sig Mcx Rattler Upper 300Blk 5.5". Manufacturer: Sig Sauer. SKU: 275918. Manufacturer part number: UAMCX-5B-300-BLK-TAP. UPC: 798681587735., 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., 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 MXC Rattler Canebrake .300 Blackout AR Pistol 5.5" - Coyote/Black - PMCX-300B-5-TAP-CANENB. Out of stock. ... Cerakote E190 finished upper and lower; 30-round polymer 300blk Magpul™ magazine. Reviews . Q …, The SIG Sauer MCX Rattler Upper is available in 5.56 NATO and .300 BLK Calibers. Shooters can convert any Mil-SPEC AR Lower into a MCX Rattler with this upper assembly. Included is the upper assembly, lower receiver stock adapter kit, side folding AR buffer tube knuckler and match duo trigger kit. Xtreme Guns and Ammo stocks a full line of SIG ..., 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..., Feb 26, 2024 ... Today on TFBTV, James Reeves discusses a landmark evolution in personal defense weapons: the SIG MCX Rattler LT. This episode isn't just ..., Good ergonomics. Trouble cycling subsonic ammo without a suppressor. Expensive. Editor’s Note: “Designed for rapid deployment from concealment, the MCX Rattler packs a punch in the .300 BLK configuration. Coming in at 5.1 pounds empty, sporting a 5.5-inch barrel and folded length of 17 inches, the MCX Rattler is definitely …, 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., An upper GI and small bowel series is a set of x-rays taken to examine the esophagus, stomach, and small intestine. An upper GI and small bowel series is a set of x-rays taken to e..., The MCX / Rattler has better build quality and a quick change barrel system. It runs better dirty and is likely more reliable overall but a bit more expensive. It’s more accurate in my experience and would be my overall choice if I could only have one. It is best with a lower back pressure can. 29., This Barrel is compatible with the Rattler ONLY. This barrel is not compatible with the MCX Virtus or Legacy MCX Uppers. It will not function with a factory .300BLK handguard. This barrel requires the 5.56NATO Rattler handguard. SIG SAUER offers upper assemblies and caliber exchange kits in various barrel lengths., Sig Sauer. SIG MCX RATTLER UPPER 300BLK 5.5" UPPERS. Edit Product. $1,899.99. $1,535.99. QTY. Add to Cart Add to Wishlist Make Offer. Out of Stock. Quantity on Hand: 0. Secure Online Ordering. Free Shipping! Item : XIUAMCX5B300BLKTAP. SKU : UAMCX-5B-300-BLK-TAP. Model : UPC : 798681587735 (No Reviews), 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., Out of stock. MCX-SPEAR LT 11.5" UPPER AR CONVERSION KIT 7.62X39-BLACK. (0) Write a review. $1,699.99. Add to Cart. Explore our premium selection of complete upper receivers for rifles. Sig Sauer offers top-quality options for your firearm needs. Shop today!