New Frontier Armory New Frontier C4 Upper Receiver Ar15 Stripped Billet Black. The C-4 Upper Receiver is unique because it was designed with input from former 3rd party contract gunsmiths. Through this process the upper receiver is given a clean...
New Frontier Armory New Frontier C4 Upper Receiver Ar15 Stripped Billet Black. The C-4 Upper Receiver is unique because it was designed with input from former 3rd party contract gunsmiths. Through this process the upper receiver is given a clean...