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Replacement recoil springs help ?


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Just inherited a WH 1927A1 Thompson. This one worked but needs some TLC. Want to replace those original heavy recoil springs. Have done a search on this forum, purchased replacements from McMaster Carr.

 

Question is, do these McMaster Carr springs need to be trimmed to length ? They are quite a bit longer than original springs. About impossible to stuff them in bolt for reassembly.

 

Goal is to tune gun up and do a SBR on it.
Thanks in advance.

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Ivan,

 

IMO it might be much easier at this point to check with Dan Block "Deerslayer" about the availability of an EZ-Pull kit.

 

In addition to the correct springs, you will need to fabricate a polyurethane buffer.

 

Here's a Thread all about The Ez-Pull setup:

 

http://www.machinegunboards.com/forums/index.php?showtopic=18312

 

 

Have Fun,

 

Joe

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Thanks for replies. I have fabricated a buffer. Have some experience with this. Purchased a BAR stock set from Dan, he does top shelf work ! Will most likely contact Dan about the rebarrel and removable stock work once Uncle sends the Tax Stamp.

 

Question is what is length of the EZ pull type springs ? have 10 of the McMaster Carr springs now, would be a shame to waste them. My Thompson is used, had some rounds through it everything seems to move OK. Will need to replace the "cheese grater" cocking knob too. Guess the replacement from Kahr should work.

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OK. Just went through all pages. Was a tough week and I did not read everything.

Thanks Joe H ! Found the length. McMaster Carr springs are 11" long, trim to 10". Saw your post about installation. Will give this a try tomorrow.

 

This gun had been worked over by my Dad. Some good things, some not so good. Way back in 1977 when he purchased it the firing pin broke after a couple hundred rounds. Showed the piece to a friend who was head engineer at a large tool making company. His friend made him 2 replacement firing pins out of better steel and properly heat treated. Told Dad he would probably never need the 2nd pin but might as well have it.

He was right !

Dad shot the Thompson quite a bit and the first firing pin still going strong.

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