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Horizontal Movement Between Upper and Lower


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getting my thompson ready to shoot tonight i noticed a slight movement backwards and forwards on my 1928 thompson....its not a lot...just a 64th+ or maybe a bit more....dont think ive noticed it before

 

is this normal?

 

 

also loaded a 50 round ww2 drum....says 9 or 11 clicks....which do i choose ?

 

thanks

 

 

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The play does not sound bad. Possibly fitting another catch button would tighten up. I reread, 1/64 inch I would attribute to slip fit for tolerances to insure interchangeability.

 

Which internals are you running, 21 or 28? Thats the difference in clicks.

 

11 clicks for 21 faster RoF, 9 for 28.

 

Ron

Edited by ron_brock
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Have it on all my Thompsons, including the Phila. Ord. blank gun I just bought. I'd think this slight movement is desirable so that the button will lock the receiver and lower together every time, without fail.

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i own a 21 kit, but im shooting the 1928 tonight.....that clears it up....

 

on the gun---its not a heavily worn gun...i assumed it was normal...i just never noticed it before...over thinking

 

thanks for the advice....being anal

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My Savage M1 and AO Bridgeport 1928A1 have zero play. My WH M1A1 does have some slight back and forth movement (about the same as yours Huggytree). Doesn't seem to be a problem and I don't notice it when shooting. I too was curious about the 9 or 11 clicks regarding the 50rd drum. Thanks for the info Ron! Todd in Oregon

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Huggy,

 

Held in by a tapered spring. It just pulls out, the spring is oversize at the top, creating the tension to hold it in place. Both parts are readily available.

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  • 2 weeks later...

The fit of the trigger frame and receiver is tricky because

if the tolerances are too loose the frame will be loose and if too

tight the frame will not slide on.

One half of one thousandth of an inch (0.0005") can be the difference

between a frame not being able to slide on and sliding on smoothly.

Having made well over 1000 receivers which customers expect their

trigger frame to properly fit and using a gage frame my rule of thumb

is that if you can "rock" the frame by holding the pistol grip and twisting it

side to side and the frame "clicks" then the rails are too sloppy. On the

other end if the gage frame will not slide on or only slide on 1/2 way the

rails are too tight.

If you can "click" your frame it is unfortunate and one the those

things that bugs you, but if the gun works....

You could try different frames until you find a better fit and use that

one for shooting and save the original to keep the gun correct when

it's hanging on the wall.

 

Bob

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i was never really worried....just something i had never noticed after owning/shooting the gun for a while....i noticed it and wondered if something was wrong...its very little movement and im sure its just within the tolerances of making every lower fit on every upper..the part was $10 shipped...so it was worth a try to see what it did...

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no

 

the thompson is one of my 'special guns'' . rarely shoot it....1-2x a year....wont shoot it for 4-6 months most likely....

 

 

i shoot my cheaper guns often (the ones $12,000 and under)

Edited by huggytree
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