FightLite MCR Dual Feed Complete AR-15 Upper Receiver with Muzzle Brake - 16.25" - M-LOK

Radical Firearms 16" 5.56 NATO 1:7 Mid-Length SOCOM Complete Upper - 12" M-LOK FCR Rail

AERO PRECISION AR15 5.56 NATO / 223 Rem 20" Complete Upper Receiver w/ Carry Handle | Black

LMT MRP-L M-Lok 13.25" Rifle Length Upper Receiver

Foxtrot Mike Products MIKE-102 Gen 2 Complete AR-15 Upper Receiver - .223 Wylde - 12.5"

LMT MRP-L M-Lok 9.25" Carbine Length Upper Receiver

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

LBE Unlimited M4 Stripped Upper Receiver, Fits AR15, Black Finish ARSTUP