datderecelltech Posted July 4, 2021 Share Posted July 4, 2021 I had a very tight barrel extension to upper receiver fitment. Tried freezing barrel and hair drying upper with partial results. Removed the extension and tried again. In absence of a heat gun, lightly polished the tail end of barrel extension on a lathe such that the back end requires a firm push to fit in and front end requires a mallet to drive in the rest. Still extremely snug with no play. Will this affect the barrel and upper fit in long run in terms of stresses or accuracy? Link to comment Share on other sites More sharing options...
caspian guy Posted July 4, 2021 Share Posted July 4, 2021 It should be fine. Link to comment Share on other sites More sharing options...
lefty o Posted July 4, 2021 Share Posted July 4, 2021 snug is good. Link to comment Share on other sites More sharing options...
datderecelltech Posted July 5, 2021 Author Share Posted July 5, 2021 thanks yall Link to comment Share on other sites More sharing options...
emjbe Posted July 9, 2021 Share Posted July 9, 2021 This might apply if it’s the upper receiver being tight. JP and BCM both need heat to get the barrel into the upper receiver. Link to comment Share on other sites More sharing options...
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