Spikes Tactical Punisher Lower/Upper Receiver Set, Semi-automatic, 223 Remington/556NATO, Cerakote Finish, Barrett Brown, Includes 13.2 in SAR3 Rail STS1615-PN3S

Radian Weapons Model 1 10" Upper Receiver and Handguard Set, Flat Dark Earth

SPIKES TACTICAL Complete Upper 5.56x45 16" Black Mid-length AR15

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Spikes Tactical Complete Upper Receiver, 223 Rem/556NATO, 14.5 in Barrel (16 in OAL with Pinned Brake), Mid-length Gas System, Fits AR Rifles, Black, Flat Top Receiver, No Sights, 12 in CRR Quad Rail, Dynacomp Muzzle Brake, No Mags STU5050-CQ2D

Radian Weapons AX556 556 NATO Brown Cerakote Semi-Automatic Lower Upper Set

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

Radian Weapons R0027 Complete Upper 300 Blackout 9" Black Barrel, 7075-T6 Aluminum Radian Black Receiver, Extended with Magpul M-LOK Handguard for AR-15