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Recoil Spring Differences.....(?).


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Interesting. I purchased 2 sets of grease gun springs from Apex. The Type 1 set is identical in length and wire diameter to my recoil spring out of 1928a1. 11.25 - 11.5 long. Very stiff springs.

The Type 2 springs are smaller diameter wire and longer. About 14.5 long. Much lighter spring rate.

Either Apex sent me the wrong springs or there is a notable difference in springs between the M3 and M3a1

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  • 3 weeks later...
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OK I measured the recoil springs in my guns. Grease Gun, OAL 14.5, wire dia. .032, 78 coils. Thompson M1A1 RIA rebuild, OAL 11 1/8, wire dia. .042, 69 coils. Thompson Savage 28A1 OAL 10 3/8 wire dia. .042, 69 coils.

When I first got my grease gun, very early serial number #0014252 someone had cut the springs down to 12 5/8 OAL possibly trying to change the cycle rate. I had a squib load from not enough pressure, I didnt know any better because I didnt have anything to compare it to Until I got another set of original GI springs. As a sidenote, many years ago I talk to a gentleman who was very knowledgeable about military firearms and he told me that the original design for the grease gun called for the springs to be wound in opposite directions but it was soon dropped. Hope this helps

Edited by bartomark
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I received my newly-made Grease-Gun Recoil-Springs yesterday........and did some counting of coils and measuring wire thichness......and what I come up with is listed below:

1: Over all free length (not compresses) came out to 13 1/8 inches (+ - 1/16" between the six springs that I received).

2: Wire diameter came to about .031"-.032"

3: The were 67 coils on each recoil-spring.

 

Please note:

1: I do not have a US GI "TM" (for a rebuild-shop-level to check/overhaul Grease-Guns) that would list the measured lengths and possibly the number of coils for a new Grease Gun recoil-spring. This may be listed in a TM at the -3 or -4 level (?)…...and maybe someone has a manual that they could "scan" that page and post for us here (?)……...I will keep looking.

2: The Company (STP-Automatics/Jeff-Turk) was quick to answer questions and ordering time was a minimum. Shipped in sturdy tube.....well packed...….and yes, once I get this original information I will be ordering again.

 

Regards,

RichardS

US Army, RET

Edited by Blanksguy
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