Update: this upper + jp bcg = returned to aero - Aero Precision M5 20in .308 CMV Complete Upper Receiver w/ Flash Hider & ATLAS S-ONE Handguard

I originally posted that the JPBCG would not go into battery and sent it back to Aero. Well I forgot about this review and Aero had gotten me the upper back in about a week from date shipped. Now the bolt locks into battery like butter. I could not be happier with Aero’s customer service in such a time of large demand. Oh and they actually head spaced the bolt to the barrel. They did a field head space but still.