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Old 09-05-2010, 18:38   #1
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580 Mini

I was wondering if you could shorten the barrel on a 580 mini and reinstall the front sight, if so it won't affect accuracy will it?
thanks Cerfp
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Old 09-06-2010, 06:55   #2
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I can, and in general it does affect accuracy..... for the better. I'm meeting with the ATF this week and hopefully I'll get the green light to reopen at the same time. Thanks!

John
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Old 09-06-2010, 07:04   #3
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So I could have you shorten the barrel then reinstall the front sight, and everything would work fine
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Old 09-06-2010, 07:30   #4
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A couple of caveats -

If the sights are properly regulating right now and have some adjustment left, and the barrel isn't cut too short - yes.

What happens is this - if the sights are already at their maximum adjustment in either plane, the shorter radius (distance between them) MAY create an issue. In general barrels cut to 17 or 17.5 inches (factory is 18.5) work out fine, but going to 16 or under can be an issue.

I remove the sight and barrel, do the work I need to and then depending on the 580 barrel I open up the ID of the sight to fit back on, or machine a shelf in the barrel on the newer tapered barrels to reinstall the sight like the factory did. I repin it and off it goes. So as long as we address the sight issue, it's an easy and quick job that works well.
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Old 03-30-2011, 17:20   #5
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I know it's been a while for this thread but I have a quick question.

I have a 580 with the new tapered barrel, but it's only 16" with no FH.

Is it enough to machine a shoulder for the sight further back, thread the end without cutting it down and putting a FH on?

It seems to me that could be done but I don't have any machining knowledge at all.
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Old 03-30-2011, 17:42   #6
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You bet there is. the barrel is likely a touch over 16", so there's probably room to cut a new crown as well if you want or need one. if you want to explore this further just shoot me an email at thegundoc@ymail.com and we can discuss options. Thanks!

Doc
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