[spencerhut]

My 1100 started to get an attitude about staying locked back after the last round is fired. What should I look at first?

[ArmedBear]

Happened to me. I looked all over for any mechanical problem; couldn't find any. What it needed was a very thorough cleaning.

I dropped the trigger group, cleaned obvious fouling with Hoppes, blasted it off with Brakleen or Gunscrubber, dried it and oiled it with Bullfrog. Cleaned and lightly oiled the bolt, carrier and receiver, and the recoil buffer wishbone thingie, and I disassembled the mag tube, cleaned it and put a little oil on the spring.

Works perfectly again.

Could have a bent part extending from the front of the trigger group, but on mine there was just a small bit of fouling or dirt somewhere. Nothing else wrong.

[220_Swift]

Good advice above. I would also suggest a new o-ring. Your might be leaking just enough that it is not going back all the way to the catch.

[ArmedBear]

Oh yeah. Replace the O-ring, too, if in doubt.

I have a bunch of them. When I did the cleaning, I checked it and found that the the one I had in the gun had lost some elasticity compared to a new one, so I chucked it and put on a new one. :)

[spencerhut]

Okay, I should have said this from the get go, it's clean, lubed and has a new o-ring.

[fearless leader]

I'm far from an expert, but I have worked with a fair share of semi auto shotguns.
Does the loading carriage engage a nipple or bump of some sort on the follower on the last shot? What condition is the magazine spring in? Is that bump or the loading carriage damaged where they meet?

[fearless leader]

If those parts are satisfactory, the next thing I would examine is the release mechanism that closes the bolt, and see if it is functional. I would look for a broken or damaged spring there, or a piece of crud, previously not seen blocking it from moving.

[ArmedBear]

a piece of crud, previously not seen blocking it from moving.

I believe that's what it was on mine. That's why I said a thorough cleaning. I'd cleaned it already; I just missed some random piece of crud somewhere. I never really figured out where it was. It just worked again, after it was super-clean, and it's worked since. That was my point, though; it's not necessarily obvious, even if you look really close, as I did. I think it can be a very small bit of crud, if it's in the right (wrong) place.

Otherwise, yeah, look for bent/worn parts. Fortunately, there aren't all that many to look at.:)

[fearless leader]

I once had an auto loading shotgun that would lock open being qued from the raised bump on the follower. It would fail to lock open sometimes because the magazine spring was weak, allowing the shell carrier to slip past, as though it were loading another shell.

[ArmedBear]

Yes. A weak spring or a mag tube that causes too much friction can do it.

That's why I would thoroughly clean the inside of the mag tube, with a wire brush on a cleaning rod, if need be. CLP might be a good choice. Then oil the spring and make sure the follower is not tweaked somehow. New ones are cheap, and you can also get turned aluminum ones if you want to bulletproof the thing.:)

[mnrivrat]

The bolt latch is located in the front of the trigger housing, between the housing and the rear of the cartridge lifter. This latch locks into the cartridge lifter via a small protrustion that fits into a slot in the lifter.

During firing the shell that is released from the magazine tube is driven rearward until the base of the shell activated this latch which then allows the cartridge lifter to travel upward and the bolt to move forward. The bolt latch can also be activated by the small silver release button at the back of the cartridge lifter. This button has a small lever that protrudes upward and pushes back on the latch to unhook it as it travels.

This is the area where you need to look for your problem.

[spencerhut]

The bolt latch is located in the front of the trigger housing, between the housing and the rear of the cartridge lifter. This latch locks into the cartridge lifter via a small protrustion that fits into a slot in the lifter.

During firing the shell that is released from the magazine tube is driven rearward until the base of the shell activated this latch which then allows the cartridge lifter to travel upward and the bolt to move forward. The bolt latch can also be activated by the small silver release button at the back of the cartridge lifter. This button has a small lever that protrudes upward and pushes back on the latch to unhook it as it travels.


Thanks, That is what I was looking for. Got side tracked by the Micostamping BS this weekend.

[sm]

mnrivrat,

What about the recoil spring running through the butt stock?

Old guns, we never had a problem.
Just wondering if the new guns are, with some of Big Greens changes and QC.