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Old 11-28-2009, 07:24 AM   #1
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M1 Carbine problem

I got an IBM M1 Carbine from the CMP last year. I never fired it(I already had 4) and ended up selling it to a buddy. He couldn't get it to fire consistantly, numerous FTFs. So, he bought a Wolff spring kit(#18055), and brought it over. When we stripped it, I found that hammer spring had been cut to almost half the length of the replacement spring. It was just barely longer than the shaft on the hammer sping plunger. So, I replaced it, and got it back together.
Once it was back together, the hammer wouldn't cock. It appeared that the hammer wasn't comming back far enough for the sear to catch it. So, we took it apart again and I looked at the hammer spring plunger. It looked funny. I had a spare, so I compared it to my spare. His had a solid "head" while mine had a hole in it. On his the overall length of the plunger was the same as mine, but the "head" was longer. So, I installed my spare on his spring and put it back together and it worked fine.
I checked Reisch's Carbine book, and found that there were two versions of the hammer spring, the second one being longer than the first. But it makes no mention of any design changes to the hammer spring plunger.
We also installed the recoil spring, and off to the range he went. Gun goes bang all the time now, but it is now having feeding issues. Apparently the slide is either not going back far enough to pick up a round, or it cycling so quickly it can't pick one up. So, he will be bringing it back to we can put the old spring back in. the new spring is about 3/8" - 1/2" longer than the old one.
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Old 11-28-2009, 03:54 PM   #2
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Re: M1 Carbine problem

The Wolf recoil springs are stronger than the originals and will often cause FTF problems. Yes there were two types of recoil spring guides. The solid head is quite rare. And hammer springs were all the same length. The difference was the number of turns, not the length. I suspect that the carbine may have been fired with cast bullets and the gs port is partially plugged. The only way to correct that is to remove the gas piston and nut and clean the cylinder. But I recommend that it be done by someone with the proper equipment. It takes a special wrench and the threads need to be chased before it is reassembled.
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Old 11-29-2009, 10:47 AM   #3
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Re: M1 Carbine problem

Well, he took it to the range, and there were Failure To Feed with the longer Wolf spring. I suspect that the new hammer spring has something to do with it also, if it is an extra strength spring. That, combined with an extra strength recoil spring may be too much for the system. So, he is going to reinstall the old recoil spring.
Since it is, or was, a CMP gun, I doubt it had cast bullets run through it. But then anything is possible.
With regards to the hammer spring. Reisch's book says that the old style spring was 2.1" long, 22 coils and the new design spring was 2.5" long, with 26 1/2 coils and had reduced wire diameter. Ruth's book gives the same coil numbers, but does not give a length. It does show a photo of the two springs side by side and the new one is definately longer.
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