remington 870

[gb0399]

I traded a box of m-14 mags for a remington 870 express magnum, thought it was a good trade, how ever when I bring the pump tp the rear, the first shell extracts, but the shell in the magazine does not release. After some time pondering the problem I found that the pump comes about 1/8 inch short of far enough to depress the release for the shell. With the bolt (and the piece under it) removed the shell ejects perfectly. Does any one know why this would be possible? Possibly a part from a similar but not identicle 870 model? Not manufactured to specs?

 

[dfariswheel]

The first thing to check is to see if the fore end is too long and is hitting the front of the receiver or something is blocking it's full movement.

Causes for the fore end hitting could be:
A too-long replacement.
The fore arm improperly installed.
A side saddle shell holder that's too long.

Other possibilities are burrs or damage in the receiver that's blocking the bolt or bolt slide.
A shell release that's not firmly riveted in place. A loose release will fail to release the shell properly.

Bottom line, SOMETHING seems to be preventing the action from moving far enough backward.
The 870 is a very simple design, and there's not too much that could be causing it.
You'll just need to look at everything that might be causing it.

Try removing the trigger group and see if it still does it.
Then install the fore end assembly and check, then just the slide, then the bolt.
In other words add parts until one of them causes the problem,

 

[gb0399]

I took the gun completely down, the release does depress with just the fore end slipped over the magazine and is not interfered with by the receiver. The problem starts when the block that the bolt rides on (don't know name of part) is inserted. I will check for damage in the receiver but there did not seem to be any upon initial inspection.
This is the third 870 that I own, got my first wingmaster at 6 from my dad. I have always been satisfied with the performance, until now...

 

[fixyurgun]

I would try the suspected part from one of the working 870s. jim

 

[gb0399]

jim... I just tried that. Sure enough, it worked like a charm. The bolt slide in the bad gun was considerably longer than the good one. I'm not sure how that happened, I'm not the original owner of the gun. I'm off to the remington site to see about ordering a new one

Thanks to all for the help