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 Post subject: 3" conversion on 870
PostPosted: Mon Oct 06, 2008 12:43 pm 
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Joined: Sat Jan 21, 2006 3:09 pm
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Location: New Jersey
Anybody know if an older 870 wingmaster can, and if so how, be converted over to handle 3" loads? I would assume a new barrel would be a wise purchase but does anything need to be done in the reciever?


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 Post subject: Re: 3" conversion on 870
PostPosted: Wed Oct 08, 2008 10:54 pm 
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Joined: Fri Oct 21, 2005 7:30 pm
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First things first, a 3 inch chambered barrel is a must, firing a 3 inch shell in a 2 3/4 inch will case extremely high pressures as the crimp "flaps" as they roll out will be inside the bore diameter and the charge will have to push past this restriction.

Second, the only difference between a 2 3/4 inch receiver and a 3 inch receiver is the ejector. For a skill smith who knows how to do the job, this is a very simple operation and if often under 50 dollars to perform.

A 2 3/4 inch receiver equipped with a 3 inch barrel will safely feed and fire 3 inch ammo, but it will try to eject the shell to early and cause a blockage.


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 Post subject: Re: 3" conversion on 870
PostPosted: Thu Oct 09, 2008 7:26 am 
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Joined: Thu Nov 04, 2004 1:15 pm
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Location: MI
Replacing the ejector requires the two flush rivets you see on the left side of the receiver be removed, new parts installed and rivets replaced. If you don't refinish the shotgun it might not look as good as it should. So factor in either mis-matched rivets or a refinishing job to the cost.


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 Post subject: Re: 3" conversion on 870
PostPosted: Thu Oct 09, 2008 10:59 pm 
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Joined: Fri Oct 21, 2005 7:30 pm
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while true, I have also seen some smiths heat the inside tab of the rivet a bit and slide a little pry bar underthere and get the rivet to release. they then use the same rivet as before to reset the new ejector.



I have also knocked out the old rivets, mic'd the head of the old rivet and used the surface grinder to match up the new rivets to the same (more or less, say a couple of tenths ) thickness as the old rivets and then just matched them up with cold blue, while not perfect, it takes good light and a knowing eye to pick them out.


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