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PostPosted: Thu Feb 26, 2015 8:45 am 
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Not posting a How-to but would be interested in what is considered "tolerance" as in passing or not passing in terms of replacement. So a range of 0.10 to 0.02 is passing then after that the bushing would need to be replaced?

Looking at this from an armorer's perspective more than improving accuracy....


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PostPosted: Sat Feb 28, 2015 9:31 pm 
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Well I think in some cases as little as .001 would work but the tighter it is the more critical it will be to have perfect angle bores to accommodate the tilt of the barrel. With a clearance of .004 or so, it's enough not to even need the angle bores (don't quote me on that number).

Neither of which as an answer. I've never seen a tolerance limit assigned to this and I would not myself assign one since there are so many other factors that affect accuracy-- which you have said is not the issue here, but to me it kinda has to be..... since if we say the limit is .005 clearance but a gun with that much shoots 2" at 28 yards, that's not bad at all. In that case I would say don't trash the bushing. If it has only .002 clearance and the gun is shooting 10" groups at 28 yards, there is a problem somewhere but it's not bushing to barrel fit obviously.

Also to measure barrel and bushing for clearance, if the bushing has an angle bore to it, measuring it at 12 and 6 could give a different result from measuring at 3 and 9.

Maybe an old military manual has the answer you're looking for if this is a situation where you really must do something like inspect a large fleet of guns and check a box.


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PostPosted: Mon Mar 02, 2015 5:32 pm 
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So the question becomes if the gun is accurate bushing helps but other factors matter more....


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PostPosted: Mon Mar 02, 2015 7:51 pm 
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All factors matter. Somewhere there's a pie chart showing to what degree, I would not necessarily agree or disagree with it having not tested individual accuracy components myself scientifically, but I can say I've seen some guns with not-great bushing fits, both barrel/bushing and bushing/slide shoot not-so-bad.


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