FANTASTIC upper receiver
This is my 2nd upper from New Frontier Armory and I could not be more pleased with the fit and finish of the receiver. Being a .40 cal the other moving parts will all play a part in its functioning, however, who doesn’t love the thump of a .40 cal carbine!! I did have to use a 10oz buffer weight to ensure enough mass on the recharge but tweaks are to be expected l!