Tube Fed Semis - are they all like the 1100?

[BattleRifleG3]

I have one tube fed semi-auto shotgun - a 12ga Rem 1100 magnum with 30" barrel.  It was after I bought it that I learned how, in my opinion, peculiar a shotgun it is.

I'm talking about the feeding-cycling system.  Where the bolt is locked back after each shot and is released by a tab hit by each shell as it feeds from the magazine.  I have an extended 10rd tube on mine and it has fed perfectly, but I can tell very clearly that the cyclic rate is changing.

I'd almost say "to heck with the 1100" and go with another tube fed semi, but then I'd have to ask if any or most other tube fed semi-autos work that way?

[mountainview]

Howdy BR,
I grew up in the SW corner of PA and had some nice hunting there way back when.

To be honest, I've not taken my auto apart to check the mechanism you describe since it just keeps working. Just a guess but from what you describe I would suspect that the magazine spring may be weakening and might be worth checking out. On a 10 rounder, that spring is likely compressed quite a bit more so than on a standard tube mag. I guess that since most people with autos shoot 2 3/4" shells more than 3" shells which would not compress the spring as much and give longer spring "life".

[BattleRifleG3]

No no no, it feeds just fine.  I'm just not keen on a variable cyclic rate based on how many rounds are left.  Wondering if Remington is the only semi shotgun that does this.

[Sx2]

My Sx2 seems to work similarly.

The "Tab" holds the shell in the tube by resting on the edge.

The BOLT seems to actuate the tab off the edge of the shotshell as it goes rearward. The carrier lifts the fresh round into place while ejecting the empty.

Once the empty is clear, the carrier comes in line with the chamber, the bolt takes the shell the rest of the way into battery.

I would think a lot of them work pretty close to the same way. As long as the mag spring pushes the fresh round out. It should be ok. The spring desighn should be such as to give = force from the first to the last shell.

You could put a force guage on the shell head (use dummys) and nmanually actuate the shell holder and see how much force is put on each shell comming from the tube, first to last.

[Dave H20 Fowl]

I only have two semi autos to look at, and ones an 1100.  My dad's Beretta works the same way.  I think the the above poster is right, the spring is the issue, it should provide a constant pressure and cycle rate.  You might try shooting an 1100 with a five round tube/spring to see if you notice a varying cycle rate.  I never have.  Other manufacturers may use better springs.  Is it a factory extension tube?  I know that there are some rifle type magazine shotguns made in the former USSR and you might be able to find a drum magazine for an 1100.  Who knows.

[mjbgalt]

or buy a new spring from remington, shouldnt be much.

-Matt

[victorcharlie]

If the gun is feeding correctly, I guess I don't understand the problem........IMHO the Remington 1100 is the standard for auto loading shotguns......It's what every other auto loading shotgun is measured against.........It's certainly a fine piece of equipment............I'd love to help, just don't understand why this is a problem?