Runs like a champ. - New Frontier Armory New Frontier Ar9/40 Match Bbl 8" 1:16 40s&w Black

f you are just starting out building blowback ar's, and im talking ACTUALLY BUILDING them not just dropping an upper on a lower and saying you built it. YOU MAY WANT TO CONSULT A GUNSMITH or someone thats built one. New frontier makes very nice components that are tough as nails. Having said that I will point out ALOT of common sense goes into these, ESP this caliber. 40s&w IS NOT a round nosed caliber so u will need to polish the chamber and possibly cut a feed ramp in but not much is needed, due to government manufactured shortages I haven't been able to put as many rounds down range as I would like but this barrel is amazingly accurate for the caliber, and runs like a dream. I didn't order via optics planet but directly from nfa. Paired with their upper reciever for lrbho on a diff brand lower, this build is awesome and runs like a dream and lovks back every time even with cheap kci mags.