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I'd shy away from a conclusion of a weak magazine spring for two reasons: the gun works fine with the factory forearm, and the gun (an 870 express magnum) is probably relatively new. This is a classic case of home gunsmithing where one's early attention to Sesame Street can be quite valuable. "One of these things is not like the other."
There is something about the replacement parts that is mechanically different from the factory part. Slow and careful (safe) operation of the action under very good light, examining all bearing surfaces and interactions of parts should point to the anomaly. My guess is that the new forearm is preventing a full travel of the slide. (credit to DoubleTapDrew).
One more look.Ok guys thanks for all the replies. I think im going to take your advice spitpatch and send the fore arm and a letter explaining the problem to hogue.
I took the gun out this weekend and fired a bunch of shells through it with no problems using the factory fore end, with the hogue fore end the last shell would still get stuck in the chamber. My friend came along with me and brought his remington 870 i tried the hogue fore arm on his 870 and it worked fine, I also tried the magazine spring from his 870 in my 870 and still did not fix the problem (the last shell still got stuck in the chamber)
His gun was new and unfired until saturday so im guessing his mag spring would be a good thing to try before i bought a replacement. The only thing thats really bugging me about this problem is why the gun operates fine with the factory fore arm but not with the hogue fore arm, I never had a problem with the hogue fore arm on my previous 870, and the fore arm works on my buddys 870 too.
Again the only difference i can think of is my 870 is an express super magnum, my friends 870 and my previous 870 are/where express magnums
yeah im confused haha
Well, my vote is against demonic posession. With the operator having used another brand new spring, I'm also leaning futher away from my first impression of inadequate spring strength.
I also would like to know a source of "cheap ammo" for a 3.5" 12 ga.
And, like OJ, I am confused now about "stuck in chamber" vs. "stuck in mag tube".
Kudos to James for a pretty darned good elimination of variables using a friend's gun for parts (good friend too!). Make sure you tell Hogue about your gun being the monster super magnum one.
In James's defense, he only used the buddy's spring to diagnose. (Pretty good idea, by the way). I'm not a shotgun guy primarily (only use them for hunting and occasional trap and skeet), and have never found any need to replace a magazine spring on any of them (the Model 12 is probably approaching 85 years old right now.).
But: if OJ's diagnosis technique (stretching the spring) proves a "work around" to the problem, I would repeat my warning to not allow this to be the solution to the problem. The suggestion of an aftermarket spring (such as a Wolff) might then be in order, since a stock one ( can we assume the springs were identical from both James's gun and the buddy's?) did not solve the problem.
None of this would tell any of us why the gun works fine and as it should with a factory forearm and not with the Hogue.
I'd shy away from a conclusion of a weak magazine spring for two reasons: the gun works fine with the factory forearm, and the gun (an 870 express magnum) is probably relatively new. This is a classic case of home gunsmithing where one's early attention to Sesame Street can be quite valuable. "One of these things is not like the other."
There is something about the replacement parts that is mechanically different from the factory part. Slow and careful (safe) operation of the action under very good light, examining all bearing surfaces and interactions of parts should point to the anomaly. My guess is that the new forearm is preventing a full travel of the slide. (credit to DoubleTapDrew).