Colt R6420/R6400/R6401 upper receiver. This upper was used on the Sporter II series of Colt AR-15 rifles during the mid 1980s. Large .315″ diameter front pivot pin hole. Like new condition with 1980s era factory Colt gray anodizing. This is the correct upper to restore one of these rifles.
Colt R6420 R6400 R6401 Sporter II Upper Receiver
$300.00
Out of stock
