Lockup/jam when hot

Re988 · Post by **Re988** » Mon Sep 04, 2017 9:12 pm

So my 870 will lockup/jam after a lot of shooting and the chamber gets warm. I know it's a very common problem. I've read on chamber polishing etc. and I've done all that with no positive results. I have a aftermarket 18" barrel and compared the two. Not sure what the hole actually does but why is the aftermarket barrel bigger? I hunted with it yesterday with no lockups/jams. Stock barrel is on the right. Any tips/info would be great! Thanks

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Website · Post by **Synchronizor** » Tue Sep 05, 2017 2:02 am

The notch in the barrel extension is what the bolt locks into.

So which barrel are you having the issue with? The factory barrel or the aftermarket one?

Re988 · Post by **Re988** » Tue Sep 05, 2017 3:02 am

Synchronizor wrote:The notch in the barrel extension is what the bolt locks into.

So which barrel are you having the issue with? The factory barrel or the aftermarket one?

The factory barrel is the one causing the lockup/jam after a round is fired and only when the gun is hot. It gets to where you have to basically mortar it to free it up

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Re988 · Post by **Re988** » Tue Sep 05, 2017 3:23 am

Here's the polish job I did on the factory barrel and bolt. Still had it locking up when hot. So I took the aftermarket barrel hunting yesterday and it never happened

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Post by **Vitaly** » Thu Sep 07, 2017 10:18 am

It is very importan to have smooth recoil lug, especially that area close to the chamber:

Re988 · Post by **Re988** » Fri Sep 08, 2017 5:22 am

Vitaly wrote:It is very importan to have smooth recoil lug, especially that area close to the chamber:

I knew that, that's the reason why I polished the chamber. I'm just trying to figure out why the action would lock up after a shot has been fired

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Post by **Vitaly** » Tue Sep 12, 2017 8:48 pm

It looks like you need to polish this area:

Website · Post by **Synchronizor** » Wed Sep 13, 2017 6:51 am

Yeah, I was thinking the same thing. The area just outside your chamber looks really scratched/chewed-up for some reason.

Re988 · Post by **Re988** » Thu Sep 14, 2017 3:34 am

Vitaly wrote:It looks like you need to polish this area:

Wouldn't that area show my symptoms regardless if it was shot #1 or shot #100? As in why would that area be worse when the chamber is hot vs no problems at all when fresh out of the safe?

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Website · Post by **Synchronizor** » Fri Sep 15, 2017 4:51 pm

Hard extraction is usually caused by nicks, burrs, flaring, or rough spots in the barrel extension and/or chamber, and that spot looks really rough. Either that or bad ammo, but I'm assuming you tried more than one brand of shells before you started polishing things.

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