AERO PRECISION M4E1-T Complete Upper, 16" 5.56 Mid-Length BRL FDE

Spikes Tactical 16" Upper 5.56x45mm 1:7 Quad Rail Mid-Length with BCG, Black - Enhanced Carbine Upper - STU5035CQ2F

CMMG Resolute 16.10" Upper 8.6 Blackout 1:3 M-LOK Rail Carbine-Length, Armor Black

TACFIRE Complete Upper 5.56 NATO M-Lok 1/2x28 Blk Nitride

AERO PRECISION M4E1 Threaded Complete Upper 16" 5.56 Barrel w/ 15" M-LOK ATLAS R-ONE Handguard - BLK

AERO PRECISION M4E1-T 5.56 NATO 11.5" Complete Upper Receiver | Black

AERO PRECISION M4E1 Complete Upper 5.56 NATO 16" HBAR CMV Barrel, 15" ATLAS R-ONE M-LOK Handguard

LANTAC Urban Tactical Complete Upper Recvr 223Wylde 11.5"