Shorten Barrel & Re-Crown - Pistolsmith
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Old 07-01-2002, 06:43 AM   #1
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Shorten Barrel & Re-Crown

For the home gunsmith, what is the best route for shortening a barrel and then re-crowning it? Specifically I am speaking about shortening a fitted barrel by about 1/4"-3/8" and then recrowning. I have a barrel that I am fitting that after the hood length is cut, still has a signicant amount protruding from the front of the bushing when installed. Are the muzzle facing and crowning tools from Brownells good enough to do the kob professionally? Any input is appreciated.
 
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Old 07-01-2002, 09:05 AM   #2
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1/4 to 3/8 " is a lot to remove prior to crowning- what are you using for this first cut ? Hand operated crowning tools should be sufficient for this job - I recommend Dave Manson's crowning tools. You can contact them at (810) 953-0732.
Good luck - let us know how it comes out.
 
Old 07-01-2002, 09:57 AM   #3
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Reccomendations accepted. I am not sure what to use to shorten it initially, what would you suggest? Esentially this is a STI barrel that when installed in the gun with the bushing installed still protrudes from the front by at least a 1/4". I think I am just going to sell or trade it and get a Kart, which I should have done to begin with -- but it's hard to pass up a bargain. Anyway, I can see that in fitting gunsmith fit barrels you could end up with a little extra barrel depending on how much needs to be removed from the hood (in length). Is it common to have barrel length left when fitting a barrel? It seems that it could be common, but only by a few thousandths I would imagine. The STI barrel is supposed to be "fitted" but it pretty much drops in on my Colt Competition slide, except for this problem. I will double check everything tonight and take a picture for posting so that you can see. Thanks.
 
 
Old 07-01-2002, 10:52 AM   #4
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You could mark the barrel with a piece of tape, saw the end off, get it close to finished length (and square) with a file, finish it square with a piloted cutter from Brownells and crown it with another piloted cutter. The results will depend a lot on your skills. If you go that route, don't try to saw right at your line. Give yourself a margin for error and work towards your line with a file.

From an accuracy point of view, doing it on a lathe would probably be the most accurate followed by the Dave Manson cutter that Ted mentioned. The least accurate method would be what I just described.
 
Old 07-01-2002, 11:08 AM   #5
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Dave, thanks for your input. That is kind of what I figured. I am curious if removing a certain amount off of the barrel end is typical for gunsmith fit barrels? I have never really heard that aspect discussed too much, so I am curious. Thanks again.
 
Old 07-01-2002, 11:31 AM   #6
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Some do, some don't. It's better to have extra metal than not enough (I don't understand - I've cut it twice and it's still too short!) :wink:
 
Old 07-01-2002, 12:13 PM   #7
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Agreed on that. I've never heard anyone say it's too long, but I've never heard it's too short either. :lol:
 
Old 08-06-2002, 02:19 PM   #8
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Quote:
Originally Posted by 10mm
Reccomendations accepted. I am not sure what to use to shorten it initially, what would you suggest? Esentially this is a STI barrel that when installed in the gun with the bushing installed still protrudes from the front by at least a 1/4". I think I am just going to sell or trade it and get a Kart, which I should have done to begin with -- but it's hard to pass up a bargain. Anyway, I can see that in fitting gunsmith fit barrels you could end up with a little extra barrel depending on how much needs to be removed from the hood (in length). Is it common to have barrel length left when fitting a barrel? It seems that it could be common, but only by a few thousandths I would imagine. The STI barrel is supposed to be "fitted" but it pretty much drops in on my Colt Competition slide, except for this problem. I will double check everything tonight and take a picture for posting so that you can see. Thanks.
i just finished re-crowning my Kimber Custom and could not be happier than a pig in mud. this small change resulted in my group sizes dropping by well ove 1/2 -- i am now shooting 1 5/8 inch groups at 18 yards.

i used Brownells tools, a 90 degree cutter to square up the face, then a 79 degree cutter to create a recessed crown. i already have people lining up to send me their barrels for me to re-crown.

i can't emphasize though that two significant issues must be addressed prior to considering a re-crown. the first is the condition of the barrel. if you have a well maintained barrel that is free of nicks, gouges, and excessive internal wear, especially in the 3 inches prior to the muzzle end, you pass test #1.

a worn out or rusted or improperly cared for barrel will not benefit much from a re-crown.

test #2 is the condition of the barrel bushing. if you can remove it by hand without the aid of a bushing wrench -- it is too loose. too much bushing to slide clearance is a bona fide accuracy killer.

if you pass both tests above, re-crowning may indeed give your accuracy a big boost. i'm going to post some pictures this weekend of what the end of my barrel looks like.

if you don't have a local smith to do the work, send me a private email. i'm sure we can work something out.
 
Old 08-06-2002, 02:31 PM   #9
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Thanks for the offer. I decided to sell the barrel and buy what I wanted originally, a Kart. Those were the tools I looked at but I figured I would just pay a gunsmith to do it as it is normally a $30 job or so.
 
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