CMMG RESOLUTE MK4 5.56X45MM NATO ASSEMBLED UPPER RECEIVER Top off your next build with this RESOLUTEA(R) Mk4 Upper Group. Chambered in 5.56x45mm, this upper group is a staple for any collection. This upper group does NOT include BCG or charging handle. SPECS Platform: Mk4 Caliber: 5.56x45mm Operating System: Direct Impingement Barrel Length: 16.1″ Barrel Twist: 1:7 Barrel Contour: MT Barrel Material: 4140CM, SBN Muzzle Device: CMMG A2 Flash Hider Muzzle Thread: 1/2 x 28 Gas Port Location: Mid Gas Block: Non-Adjustable 0.750″ Upper Receiver: Billet 6061 T6 Alu Mfg: Cmmg
Resolute(R) Mk4 300 Blackout Assembled Upper Receiver - Resolute Mk4 300blk Assembled Upper Rcvr 16.1" Bbl Black Original price was: $595.38.$457.99Current price is: $457.99. 
Mk18 Stripped Socom Upper Receiver W/ Handguard Only - Mk18 Stripped Socom Upper Receiver Original price was: $899.99.$749.99Current price is: $749.99. Resolute(R) Mk4 5.56x45mm Nato Assembled Upper Receiver – Resolute Mk4 5.56 Nato Assembled Upper Rcvr 16.1″ Bbl Black
Original price was: $595.38.$459.99Current price is: $459.99.
