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Thompson SMG - light primer strikes.
#1
Anyone have any experience with a Thompson SMG and light primer strikes? I'm seeing a dimple on the primer, but round not firing. It can be a little sporadic, sometimes will get 3 or 4 rounds through and then it will happen again. Firing pin looks ok, doesn't look broken.

Hard to get a picture of it, but here is the firing pin.

[Image: kd33hd.jpg]

And the gun itself.

[Image: 2vlsjzq.jpg]
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#2
(09-18-2012, 08:11 AM)mikeb0 Wrote: Anyone have any experience with a Thompson SMG and light primer strikes? I'm seeing a dimple on the primer, but round not firing. It can be a little sporadic, sometimes will get 3 or 4 rounds through and then it will happen again. Firing pin looks ok, doesn't look broken.

And the gun itself.

[Image: 2vlsjzq.jpg]


Can't help you - sorry - but have to say that I want that Thompson so freaking bad! Droooooool...
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#3
(09-18-2012, 08:43 AM)thebearpack Wrote: Can't help you - sorry - but have to say that I want that Thompson so freaking bad! Droooooool...


It's mine you can't have it! My precious ... Ok, just kidding. This was the Holy Grail for us though in our NFA collection. It's a blast to shoot - when it's working correctly - which hopefully when I figure out what's causing this it will be again.

If you were closer to my area of the state I would certainly let you shoot it.
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#4
(09-18-2012, 09:10 AM)mikeb0 Wrote:
(09-18-2012, 08:43 AM)thebearpack Wrote: Can't help you - sorry - but have to say that I want that Thompson so freaking bad! Droooooool...


It's mine you can't have it! My precious ... Ok, just kidding. This was the Holy Grail for us though in our NFA collection. It's a blast to shoot - when it's working correctly - which hopefully when I figure out what's causing this it will be again.

If you were closer to my area of the state I would certainly let you shoot it.


I can't help with the issue you're having, but where in Bucks do you shoot that? Any outdoor ranges? I'm looking for an outdoor range to shoot my M11/9.

Beautiful gun by the way, that thing is MINT.
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#5
(09-18-2012, 09:25 AM)bac0nfat Wrote: I can't help with the issue you're having, but where in Bucks do you shoot that? Any outdoor ranges? I'm looking for an outdoor range to shoot my M11/9.

Beautiful gun by the way, that thing is MINT.


No outdoor that I've found yet in Upper Bucks. All the clubs seem to frown on Happy Switches. I usually go to Clayton's or Classic, though they are a little bit of a hike for me. Usually 45 minutes minimum if I get lucky with traffic.
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#6
I'm not familiar with Thompson, but I own an open bolt UZI smg.

If I don't have enough lubricant on the inside receiver & bolt, especially when the temp is cooler and gun is not warmed up, the bolt moves slower, and does cause lite primmer strikes. I have this problem running 45 ACP in my UZI.

When I'm using new magazines, the spring pressure causes the bolt to slow down.

If your extractor claw is super dirty, this will prevent the extractor to snap over the case rim, and cause lite primer strikes.

I made a video a few weeks ago. I was beta testing a 45 ACP magazine for Pro-Mag Industries. Their earlier mag's had problems. They are out in California, and are limited in testing the products they make.
I experienced bolt drag off the first try. I over loaded the 22 round magazine by putting in 23 rounds. Ended with a lite primmer strike on the round.

http://www.youtube.com/watch?v=o9h748pLz_0

Hope this is of some help.

Beautiful Tommy gun!!

Nick
mirage, proud to be a member of pa2a.org since Oct 2012.
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#7
Nice looking m1a1!
I see its a West Hurley. I would start by replacing parts with USGI parts. First thing replaced most often is mag catch and components.
Try firing it by holding the mag and pulling it down when shooting. Im wondering if the mag is riding too high and you are loosing some momentum. Same as the bolt drag as posted above with the Uzi.

Has it done this to you from day one?
The firing pin looks ok from the picture, but tough to tell right now on my phone. M1 and M1A1s have the pin machine out of the bolt face. After many many round they may wear down a bit. At that point, the entire bolt needs replaced. But i think you are still good. The gun looks hardly used. Has this one been shot alot, by you or previous owners?

I would also check your lube as stated above. But im betting is a mechanical issue.

Look at northridge international. They generally have a good many parts. Or pick up an entire M1A1 parts kit and cannibalize it for yours.
http://www.northridgeinc.com/store/index.cfm/c202

Check out http://www.machinegunboards.com
A bunch of Thompson guys and info there.
Bear Paw Arms, LLC
Contact us for your NFA fix.
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