Resolute MK4 5.56NATO Assembl Upper 14.5"BBL w/P&W Brake BLK
Workhorse Blem Stripped Upper Receiver for AR-15 FDE
MK12 MOD 0 SPR Gen II 5.56mm 18" BBL 1-8 Twist Upper Black
338 ARC Complete Upper Receiver 12.5"BBL Pistol Length BLK
MCR Dual-Feed Upper Picatinny Dry Film
MCR Dual-Feed Upper Picatinny 12.5in Dry Film
MCR DUAL-FEED UPPER MLOK
MCR Belt-Fed Upper Receiver Auto 16.25" 1913
MK16 14.5" URGI Upper CHF Barrel, ACH, REBCG 5.56mm DDC
Sons of Liberty Gun Works Stripped AR-15 Upper Receiver
