Josh, Mike, and Nick describe how to square off the receiver face of an AR-15, as well as a few tips for accurizing your rifle build during barrel installation.
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Is lapping a receiver necessarily required on a quality receiver? I guess what's to say the $35 lapping device doesn't have more imperfections to a $600 billet upper?
Sleeve retaining compound is not the same as the bearing retaining compound.
Sleeve being a pressed fit liner pushed into a bore in an engine.
Bearing retaining compound will fill gaps.
We use it at work when red loctite doesn't hold. I cringed a little bit when I seen it being used here. That's definitely a SOLID bedding job.
Did not know about the green loctite on the barrel extension. Thank you.
I like how Nick finger fucks the upper receiver at 1:42, then smiles about it and everyone moves on like nothing just happened.
Great video series guys, thanks for sharing I enjoyed it. I have a question for you guys at Criterion, If installing a barrel into a upper receiver that is a tight fit (BCM M4 upper) as they have a slightly undersized Inside Diameter for barrel extension and require heating to get the barrel to slide in, do you guys still recommend using the loctite 609 for bedding of the barrel? Or is the thermal fitted barrel straight into the upper enough? Thanks again.
So use locktite between the barrel extension and upper? Not anti-seize?
Nice work Mike & Josh!
Great video! And a rather clever lapping device. At $35 or so on Brownells certainly seems a worthy addition to the toolbox.
Perhaps something like gasket compound should work better holding up to the high temperatures the barrel will experience. Don't think the Loctite will hold under those conditions. My preferred method is to use stainless steel shim stock as explained in