Harrington & Richardson Retro M16A1 Upper Receiver, Gray, Blem

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

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

GUNTEC AR15 SLABSIDE STRIPPED BILLET UPPER RECEIVER BLACK

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

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

AERO PRECISION M5 .308 Stripped Upper Receiver - Anodized Black