05-31-2020, 02:16 AM
With every BCM upper I have used a heat gun and just heat it for about 5 min and the barrel will slide right in. As for lapping I check all my builds now and find some uppers need it some do not, BCM is usually pretty good but I do check them all. As for glue no need. Good luck with your build.
NRA Endowment Member, GOA Life Member, FPC Member, VDL Member

