Guntec USA Guntec ar9 bolt carrier group 9mm mil-spec nitride FEATURES:
-Compatible w/ Glock & Colt style lower receivers
-8620 Steel
-External Extractor
-Dust cover compatible
-Fully heat treated
-QPQ Salt Bath Nitride finish
Other Features: 8620 steel bolt carrier 9310 steel bolt mil-spec design for 9mm ar9 made in usa