02-02-2020, 12:47 PM
Manually pull back the charging handing slowly and see if you feel any binding occurring as you pull back especially as near the last couple of inches. What weight buffer are you using and you didn't to happen to measure the gas port when you removed the gas block? I'd look for gas leaks around the gas block and gas tube as well, the couple of cbc uppers I've seen didn't instill confidence and the barrels looked like the came from bca.