I thought he said that under .0025 he just used green loctite.
Here's a link to a variety. There are several more if you search Amazon for "stainless shim stock"
https://www.amazon.com/dp/B005I58PZE
Make sure you get the polished and hardened stuff only. Otherwise it creates resistance when you're trying to insert the barrel into the upper.
Last edited by georgeib; 12-21-19 at 05:43.
“You have made us for yourself, O Lord, and our heart is restless until it rests in you.” -Augustine
Probably in another video where, like many other demonstrations of difficult tasks, he holds it in the pit of his stomach and bends over to complete it while blocking the view.
Maybe he will have enough class to come up with the barrel seated and simultaneously release a dove in to the air.
I use the "pi x diameter" formula (high-school math) to calculate how wide a piece to cut the shim, length is distance from flange to just-short of feed ramp scallops. The math works. I put the seam aligned with the barrel extension pin, and just trim the corners at 45* to clear the pin at the seam, about a quarter-inch, no need to get elegant about the pin-clearance notch.
I lightly coat the inside of the receiver bore with grease, and the barrel extension. Also a very light coat of grease on the shim, the grease helps the shim stick to the barrel extension, all to facilitate it all slipping into the receiver. a rubber band helps, or a thumb.
What shim thickness are you typically using?
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