PSA 16" Mid-Length 5.56 NATO 1/7 Nitride MOE Upper Receiver, ODG

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

Geissele Automatics 5.56 USASOC Improved Complete Near-Clone AR-15 Upper Receiver - Desert Dirt- 10.3" - Open Box

Bushmaster AR-15 Complete Upper Minimalist SD 556 Nato AR15 16" 90025

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

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

Expo Arms 16" 5.56 NATO AR-15 Barreled Upper Receiver - 15" M-LOK Handguard - A2 Flash Hider - Open Box

BUSHMASTER QRC Upper 5.56 NATO 16" - Black