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Old September 3, 2010, 07:47 PM   #1
Junior Member
Join Date: September 3, 2010
Posts: 1
Tommy gun firing pin breakage

i have a buddy with an auto-ordnance "tommy-gun" whose firing pin litterally broke in half and now the bolt will only actuate half way open and will not allow him to dis-assemble the weapon. The other half of the firing pin fell out of the weapon when he pulled back on the bolt.

so, question 1) has anybody ever heard of this?
2) is there a technique for allowing dis-assembly of the bolt and associated components?

thanks for any and all replies, there will definitly be a follow up on this one.
"DOLLY" is offline  
Old September 4, 2010, 10:53 AM   #2
44 AMP
Join Date: March 11, 2006
Location: Upper US
Posts: 17,167
Is the bolt stuck part way back? If you can get it closed, you ought to be able to get the upper off, and disassemble from there.

My extractor broke, about the 3rd mag I shot. Bolt was jammed half way open. After a while, and while trying to get the upper off, it cleared enough to go forward, and things came apart ok after that, uncluding what was left of the broken extractor.

Replaced extractor, and the gun has run fine ever since.

And no, I don't hold the broken extractor against the maker. I got the gun used (looking new, but used), and a broken extractor (or firing pin) is something that can happen to any gun, at any time.

If its still under warranty, send it back. If you can get it apart and fix it, fine. IF not, take it to a gunsmith.
All else being equal (and it almost never is) bigger bullets tend to work better.
44 AMP is offline  
Old September 4, 2010, 06:53 PM   #3
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Join Date: May 4, 2001
Posts: 7,033
Due to the really odd-ball Auto Ordnance Semi-auto firing pin breakage, while not common, is not unusual.

The firing pin is a weird dogleg design, made from a stamping. The stamping leaves a rough, ragged edge surface that causes stress risers and can lead to breakage.

The best way to do it is to turn the gun upside down and gently "wiggle" the bolt back and forth to try to get the broken section to drop back into the bolt.
Once you get the pin back in place, you can disassemble the receiver from the trigger group.

If you can't get it apart, send it back to Auto Ordnance for repair.
If you can get it apart, buy a new firing pin and use stones to smooth up the stamped edges. Don't remove much metal, just get some of the ragged edges slightly smoothed to help prevent stress breakage.
Dfariswheel is offline  

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