Items Available For Purchase Today Sig Sauer RMPX 9mm Carbine folding stock... $2,049.99 SELLER: Xwerksaz Sig Sauer MPX Competition (RMPX-16B-9) $2,179.99 SELLER: Jay's Guns & Accessories IV Sig Sauer MCX-Spear (RSPEAR-762-16B) $4,199.99 SELLER: Jays Guns and Accessories Sig Sauer MCX (RMCX-762R-16B-LT) Spear L... $2,499.99 SELLER: Jays Guns and Accessories SIG 556 Commando NIB $2,500.00 SELLER: fDcAL Sig Sauer 716 Tread AR10 X-Werks Tungste... $1,699.99 SELLER: Xwerksaz Sig Sauer M400 Tread Predator $999.99 SELLER: Silver Creek Outfitters BRIGADE MFG BM-9 RIFLE 9MM 16" BBL 33RD... $899.00 SELLER: Jr's Gun Sales Sig Sauer M400 Tread Predator, 5.56mm NA... $1,200.00 SELLER: TheMarksman Sig Sauer Cross (CROSS-65-18B) $1,749.99 SELLER: Jays Guns and Accessories Sig Sauer P365 Micro Compact 9mm 10+1, 2... $439.00 SELLER: The Exchange Sig Sauer Sigm400 Tread Pistol 223 Rem/5... $999.99 SELLER: DEGuns_net Guns Rifles Sig Sauer Sigarms Rifles Sig Sauer MCX Blackout W . Conversion kit | 629 | 267 | ?t=&sft=<id=&co=&og=&ong=&to=&lid=&cid=629&as=&mn=&mx=&f=&ca=&ffl=&oi=&dn=&zipcode=&distance=&limittostate=&pagenum=1&numberperpage=12&sort=&local=&sold=0&sku=&upc=&bl=&gf=&ff=&distributorid=&manufacturer=&model=Lc | 31.2637ms See All Sig Sauer MCX 300 Blackout W/5.56 Conversion kit For Sale from: Xtreme Guns and Ammo ( FFL) | Positive feedback: 100% View | Verified Seller | 149 Completed Sales View Sellers Items Sig Sauer MCX 300 Blackout W/5.56 Conversion kit For Sale from: Xtreme Guns and Ammo | Positive feedback: 100% View | Verified Seller | 149 Completed Sales View Sellers Items Xtreme Guns and Ammo Seller Since: Oct. 2015 Identity Verified ( RICHMOND, TX ) This seller is an FFL City: Richmond State: TX SOLD - $1,899.00 Shipping: See Description (or Arrange local transfer) Accepted Payment Methods: Returns: No Returns Description: SIG MCX Carbine .300 BLK w/ 5.56mm caliber conversion kit Introducing the SIG MCX™ 300 BLK Carbine. Engineered for 300 BLK. Built from the ground up to be silenced, light and short. A breakthrough in modularity. The result of years of toil and sweat, the SIG MCX™ 300 BLK Carbine is proof that the dawn of a new era doesn't happen overnight. SIG MCX Carbine .300 BLK NO MATTER THE CONDITIONS. The SIG MCX™ 300 BLK Carbine is an innovative weapon system built around a battle-proven core: SIG's gas-operated, short-stroke piston system. Trust it for the outstanding performance, no matter the conditions, that you've come to expect from the leading name in firearms. SIG MCX Carbine .300 BLK A BREAKTHROUGH IN MODULARITY. Even while in the field, you can configure the SIG MCX™ 300 BLK Carbine as needs or conditions change. The combination of the 13" monolithic upper receiver and handguard create a 17 3/4" continuous top rail. The upper is backwards compatible with any mil-spec AR lower, allowing you to upgrade your existing AR platform to the SIG MCX™ 300 BLK Carbine. The AR upgrade kit includes side-folding stock assembly and adapter. SIG MCX Carbine .300BLK SHOOTER MAKE READY. The SIG MCX™ 300 BLK Carbine stands as the first rifle built to be silenced from the ground up. It also accepts a broad array of accessories, enabling you to build a complete weapon system for any scenario or environment. SIG MCX Carbine .300BLK Specifications: Manufactures Item Number: UPC: Caliber:300BLK Action Type:Semi-Auto Operating System:Gas Piston, Rotating Bolt Stock Type:Multiple Configurations Forend Types:Alloy KeyMod Weight w/o Magazine:2.72 kg / 6 lb Overall Length:908.05 mm / 35.75" Barrel Length:406.4 mm / 16.0" Rifling: 1:6 Trigger Type:MIL-SPEC:6.6-8.6 lb / 29.36-38.26 N Trigger Weight:6.6-8.6 lb / 29.36-38.26 N Mag Type:AR-15 Type Mag Capacity:30 Free Shipping and No Credit Card Condition: New In Box Brand: Sig Sauer Model: 798681517534 RMCX-300B-16B-TFSAL-P-CKIT Caliber: .300 Blackout Item #: 933995619 Location: TX Trades Accepted: Share: Shipping Notes: UPS Largest LWRC dealer in the Nation. Largest NEMO Arms dealer in the Nation. Items You've Viewed Recently Sig Sauer MCX 300 Blackout W/5.56 Conver... $1899.00 SELLER: Xtreme Guns and Ammo (FFL Dealer) Add To Cart