Getting close on my first AR build. A couple of things don't seem to be working out right. First: The bolt hold feature does not seem to work. Not when fired as I haven't gotten that far yet. When I manually pull the operating lever with an empty mag inserted BCG still flies forward into battery. This happens even if I "help" the bolt hold with my thumb. BCG spec issue? Could this indicate a buffer spring issue? Second: Free float handguard is contacting gas block/front sight base. It appears that it is even preventing the block from riding all the way home to its stop on the barrel. It seems to me this invites an undergassed situation and probably will be worse for accuracy then a standard handguard. I plan to go after the parts of the handguard with a dremel and file to relieve the areas of contact and insure full seating of gas block unless I here different advice here. Some info on the build: Precision Aero upper and lower RRA lower parts kit R guns BCG AIM Industries Free float mid length hand guard Troy and Magpul mags Any advise and or abuse will be welcome.