870 express - play in the slide?

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nightsins

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*Mods please move - Wrong forum my apologies

I recently installed a rail mount which required the 870 to be dismantled down to the trigger in order to place the mount on and then replace the two screws with the ones that came with the mount.

Today I got out to the bush, and noticed that when I cycled the action it would lock firmly as it should but when I squeezed off the trigger (dry fire/function test) the slide and action would have play and wouldn't be locked in place exposing roughly 1/8th of an inch gap. I can ready the shotgun release the trigger then holding the shotgun upright the slide and carrier group will slide back exposing that gap.

Is this the norm for this action? If not, any suggestions as too what the issue may be? Luckily I had my rifle with me too so this mornings hunt wasn't a disaster :)

Quick Recap:
- New 870 express
- Installed this rail mount: weaveroptics.com/rings_bases/mounting_systems/no_gunsmith_shotgun/


Thank you in advance!
 
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I can speak to the shotgun itself but not the mod. I have the Remington 870 Express Super Mag, the slide & action have been tight even after cleaning and general use.
 
After you squeeze the trigger it readies the forearm to come back for a "PUMP". This is a PUMP gun. You should not have to press the release button after a shot. I just tested mine to understand what you say and yes this is normal and yes it is supposed to happen even after firing with just snap caps.

After you take a shot the recoil can push the whole slide backwards which is a good thing not a bad thing. This enables quicker follow up shots.

That is whats happening from what you seem to explain.
 
Thank you both for your replies. Winchested, I appreciate your explanation and taking your time to test what I was talking about! :)

Cheers,
 
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