If anyone doesn't have a proper tap and die to thread the brass adapters perfectly you can make your own by buying steel (not anything soft not brass) hex nuts that have the exact threading like your threaded barrel and LDC has then use a hacksaw-jigsaw blade and cut across the inner nut threads 4 cuts 12 o'clock 3oclock 6oclock and 9oclock positions all at a slight angle. Then screw it to the brass adapter deeper cut side screwing in and out a little at a time till it goes all the way. Same applies for a stripped female threaded hole. Hacksaw a proper thread matching steel hex bolt at 4 positions slightly angled towards the threads' tip.