Smith and Wesson M&P AR-15 Complete Upper Parts Kit

Timber Creek Outdoors TCO Enforcer Upper Parts Kit for AR-15, Blue - E UPK B

Timber Creek Outdoors TCO Enforcer Upper Parts Kit for AR-15, Red - E UPK R

AERO PRECISION AR15 Complete Upper 16" 5.56 M4

Timber Creek Greyman AR-15 Complete Build Kit, Urban - TC GK U

Timber Creek Greyman Complete AR-15 Build Kit Black - G LPK BL

Timber Creek Greyman Complete AR-15 Build Kit, Stealth - TC-GK-S

Timber Creek Outdoors AR Lower Parts Kit for AR-15, Robin's Egg Blue - AR LPK RE