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Go to the German website and download a manual and parts list. They are avail in English.

German Sport Guns GmbH - GSG-1911

This may help while you are waiting.

John Ed

I have not had any problems.. But I have only used High Velocity ammo. The manual says you can use Standard Velocity but I have not tried any. That may be where some are experiencing problems.

As...

I have purchased three in the past year. One for myself and one for my each of my sons.
The early ones have a "pot metal" barrel bushing, use a magnet to check. If you have such contact American...

Jared,

Yes it does have the "Punch Marks" like yours.

If I may suggest you should invest in Bruce Canfield's book on Combat Shotguns. Well worth the money.
I even found reference to the...

Jared,

I have S/N 93034X in similar condition.
Mine has a "Pat.Appl For " bayonet adapter. The stock however was unmarked.
This may open up a can of worms but I do subscribe to the...

Looks like a Lyman 17. They list several on their website with dimensions.
A 17AMI is listed. John Ed

Looks to be a Winchester model 12 Trench Gun. Mainly because of the serial number and the magazine tube. Hopefully you can locate a 4 X 19 handguard and have it riveted to the bayonet adapter.

...

Guys,

I need to make a correction as to the S/N of my riot gun.

Got it out in Daylight to make photos. After checking the pics on the computer ..... the S/N is 92687X

I was reading the 8...

Viper

Sounds like a good idea to send photos to Mr. Canfield.

I don't know if anyone has access to Springfield Research Service to check and see if any of these serial numbers show up.

As...

Viper

Yes it does have the large U.S. on the left side.

I think you are correct as in regards to the contract speculation.

Hopefully others will turn up.

John Ed

After seeing the original post and pics . I finally went and dug out of my safe a similar shotgun.

Here are the stats.
Winchester Model 12 S/N 92637X
Barrel length 20 in.
Barrel marked cyl....

Simpson Ltd. shows 520-30 Trenchgun Stocks in inventory. These are actual stocks not repos. $45.00 plus shipping.

You may wan to check the Jouster forums now that its back, There may be other...