Pump action opening when firing express shells

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john17427

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Oct 23, 2010
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I wanted to get opinions on a Remington 31 pump shotgun I use on a regular basis. The 31 is a precursor to the 870 and several other shotguns in use today. When I fire heavy 2 3/4 loads in it, the action will open on its own anywhere from an inch to almost fully open. I ruled out it being related to recoil and my hand on the slide by firing it without a hand on the slide. Even with that test, the bolt does not go far enough back to eject the shell, but it goes back several inches. A Web search on this phenomena yielded two camps; one says it's working fine and as designed, and some say it isn't. What say you?
 

yote72571

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Jan 10, 2010
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Rosie Ar
Just makes the follow up shot quicker. Ithaca 16 gauge still does it to this day.


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john17427

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Oct 23, 2010
743
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Baton Rouge
Thanks guys. Yeah, I'm kind of torn between whether it's functioning as designed or the action bar lock is worn. The video does show exactly what I'm seeing though. The action opens a good bit when firing heavy loads like his sxp does. I want to try it with light loads and see what it does.
 

Bigchillin83

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Feb 27, 2012
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Just makes the follow up shot quicker. Ithaca 16 gauge still does it to this day.


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Yup!!! I have an old Ithaca 16g with a poly choke on it and all you do is hold the trigger down, every time pump rides home a shot rides out!!!! lol it does 75% of the pumping for you!!!
 

AdvancedLaser

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Feb 15, 2021
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Keep in mind that bolt lockup is designed to contain a pretty healthy explosion. Why not stop by Reulet Gunworks and get them to look at the internal component parts and opine on its condition. Having an OOB detonation is quite a bad experience.
 

yote72571

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3   0   0
Jan 10, 2010
138
16
Rosie Ar
Keep in mind that bolt lockup is designed to contain a pretty healthy explosion. Why not stop by Reulet Gunworks and get them to look at the internal component parts and opine on its condition. Having an OOB detonation is quite a bad experience.

Is it not the same as a .22 with blow back design ?


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