Description
A Colt M4 mil-spec upper receiver, as mil-spec as can be.
Features the M4 marking on top of the receiver extension face, (not pictured) a coating of internal dry film lube, and pre-installed forward assist & dust cover.
![[Service] AR-15 Upper Receiver Assembly](https://cdn11.bigcommerce.com/s-akcawsxpxw/images/stencil/600x600/products/334/624/upperbuild1__65022.1743744305.jpg?c=1 "[Service] AR-15 Upper Receiver Assembly")
![[Service] AR-15 Upper Receiver Assembly](https://cdn11.bigcommerce.com/s-akcawsxpxw/images/stencil/600x600/products/334/623/upperbuild2__21444.1743744305.jpg?c=1 "[Service] AR-15 Upper Receiver Assembly")