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

Bushmaster M4 Patrolman's Flat Top 5.56x45mm 16", Black - 0010011BLK

Bushmaster XM-15 Standard 16" A3 Patrolman's 5.56 Semi-Automatic AR-15 Carbine - 90831

Bushmaster A3 Patrolman .223 Rem/5.56 16" Barrel Flat-Top Complete Upper Assembly - 91822

Patriot Ordnance Factory Minuteman 10.5" Complete Upper 5.56x45mm, Patriot Brown - 1817

Bushmaster M4 Patrolman's 20" AR-Style Upper Receiver 5.56x45mm 1:7, Black - 0040008BLK

Bushmaster QRC 16" 30rd .223 Rem/5.56 AR-15 Rifle - 91046

Bushmaster QRC II LTW 16" Classic Upper 5.56x45mm NATO 1:7 Carbine Length, Black