04-07-2021, 09:45 PM
Up until my latest, I have used BCM uppers that always require a thermal fit. That process along with truing the receiver face is something I have grown to believe in. The latest, with a Precision Firearms Lilja 720 I just received from Mark last week, I utilized .001' Stainless steel stock to mate the barrel and upper. In the end, with the end result I had to freeze the barrel and heat the upper to get her together. With about 120 shots down the tube that barrel appears as though it will be hitting above my pay grade! I've done the 620 Green on one assembly with a less than tight fit on. That rifle is a Group Buy Green Mtn. 12" Grendel and is damn accurate rifle. I'd just as soon stay away from the Loctite though.