us army colt m4a1 pip

custom gbb workshop.

us army colt m4a1 pip.

Customization esd gbb replica.

deep marking.

cerakote.

forging 7075 t6 upper lower.

steel FSB.

steel heavy barrel.

steel flash hider cw 12mm.

steel ambi safety.

steel barrel nut.

stainless steel buffer.

side sling swivel mount.

matech rear iron sight.

detail fix.

Custom GBB workshop