5.56x45mm NATO Upper Receivers

Harrington & Richardson Retro 604 "Air Force" Complete Upper Receiver, 1/7 Twist, Gray

Harrington & Richardson "Slickside" 20" Complete Upper, Gray 1/7 Twist

BLEM Harrington & Richardson Retro M16A1 20" AR-15 Upper 5.56 1:7 Rifle Length, Black

BLEM Harrington & Richardson Late 723 16" Upper, 5.56, 1:7 Gray, C7

Harrington & Richardson Late 723 16" Upper, 5.56, 1:7 Gray, C7

BLEM Harrington & Richardson DMR Complete 20" Upper, 1/7, Black

BLEM Harrington & Richardson C7 Stripped Upper Receiver, Gray

Harrington & Richardson C7 Stripped Upper Receiver, Gray

BLEM Harrington & Richardson C7 Complete 20" Upper, Black

BLEM Harrington & Richardson M16A2 Complete Upper Receiver, Gray

Harrington & Richardson M16A2 Complete Upper Receiver, Gray

Harrington & Richardson BLEM M16A2 TIA 10" Complete Pistol Upper

BLEM Harrington & Richardson 11.5" XM177E2 Complete Pistol Upper, Gray

Harrington & Richardson 11.5" XM177E2 Complete Pistol Upper, Gray

BLEM Harrington & Richardson 733 Complete 11.5" Upper, Black

BLEM Harrington & Richardson C7 Stripped Upper Receiver, Black

Harrington & Richardson C7 Stripped Upper Receiver, Black

Blem Harrington & Richardson XM177 10" Complete Pistol Upper, Gray

Blem Harrington & Richardson XM177E1 10" Complete Pistol Upper, Gray

Harrington & Richardson XM177E1 10" Complete Pistol Upper, Gray

Harrington & Richardson BLEM M16A2 Chrome Lined Complete Upper, Black

Harrington & Richardson BLEM M16A2 Chrome Lined Complete Upper, Gray

Harrington & Richardson M16A2 Chrome Lined Complete Upper, Gray

Harrington & Richardson BLEM M16A2 Stripped Upper Receiver w/ M4 Feed Ramp, Black