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M1A1 Runs a Few Shots After Releasing Trigger


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Fellow Forum members,I will describe what My WW2 M1a1 is Doing.

When I release the trigger, it usually will go to slide lock.

Sometimes I get 1-2 extra rounds.

Yesterday I got 4 or 5 after releasing the trigger

Ammo was Factory 230 Grain Ball, Remington,federal, Speer

 

None of my other TSMGs do that

 

Any thoughts would be appreciated

 

Thanks

 

Haris357

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Usually this is due to the bolt not traveling back far enough to catch the sear. Weak ammo is one cause. Lack of lubrication is another. Look for anything that is creating drag in the bolt movement.

 

I had a similar problem recently with an MP40 using Blazer Brass 9mm. Switched to Winchester NATO and problem disappeared.

 

YMMV

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Also, make sure it is clean. If it's gummy it could be sticking. Had my M1 do that when I first got it. Took the lower and put it in a ultrasonic cleaner and was surprised at all the crap that came out of it, even though it looked fairly clean.

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Had a similar problem with a Sten recently. The main spring was the culprit. Noticed it was stiffer/ longer than some spares I had. Replaced spring. Problem solved. Todd in Oregon

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The barrel, sear and bolt all look good??

Why would the barrel have a hand in this issue?

Badly worn barrel if the round is not sealing it will reduce some of the blow back.Kind of a long shot but worth a look. Edited by Petroleum 1
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My Numrich M1A1 started doing this . Replaced all the small parts and springs one by one . No good . Replaced the entire lower with a friends lower off a rebuilt WW2 . Worked fine . Ordered a GI lower , installed it , never another problem . Then the Numrich M1928 started the same thing , replaced the lower , no more problems . Sold both lowers to gents here who wanted them to upgrade the looks of their semis , recovering most of my costs . Win-win-win all the way around .

Chris

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I had that problem on my 28 , replace the bolt ,ran perfect after that

 

Tino

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I dont know how hard or easy it is to get to the sear and the spring. I have a whole bunch of parts arriving from an auction so I will be able to fix it.

I guess i can swap bolts, etc from another m1a1 that i have

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There are a couple of YouTube videos that show how to take the trigger housing apart.

Thanks will watch and do that

I do have a spare complete lower. Maybe I should just swap it in and try that

Edited by Haris357
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  • 1 month later...

Problem solved, gun now runs like a "sewing machine" Are sewing machines a standard(lol)?

 

Got a new savage sear and spring and the new spring had lots more tension than the old one

 

I did try stretching the spring first but that didnt help.

 

Thanks to all for all your help.

 

Ran a timer on the gun and it shoots 10 to the second. 600 RPM with Tula Steel Case ammo

Ran 100%

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