Help with a family M1 carbine

[DaveHH]

The sear feels rough? Maybe someone tried to lighten trigger pull with a stone and went through the hard facing and the sear is now being chewed up? If you look at some later carbines (Winchester?) you will see a very noticeable section on the sear that is polished at the factory. Early ones not so much. The first thing I'd do is take out the Wolf springs and put them away, get a new sear and change the sear spring to a GI spring. Perhaps someone got a bag of Wolf springs and put the wrong one in the sear? There are no instructions with the Wolf spring assortments.

[painter777]

Seen on the Video that when the Hammer is full forward that the left edge of the Hammer stop isn't resting on top of the left rail of the Trigger Housing..... Small gap between.
Only reason I could think would be:

The Upward push on the bottom of the Hammer by the Sear. If the Pin hole on the Hammer is reamed out..... It may be causing this. Easy enough to check if your going to be looking at the Sear. Also look for extra play.... like side to side wobble with the Pin thru the Hammer. With and Without the Hammer spring and it's Strut installed.

Maybe not it, but worth a look while your in there.

**** Where do you live? ****

[jimb16]

Not very likely since it also happens when he pulls the op slide back manually.

True....but it is a remote possibility also barrel alignment could be off causing drag od the slide, but again that is another very remote possibility. I've worked on enough carbines to not discount almost anything. To me the most likely suspects are the trigger spring, sear spring and sear faces on both the hammer and sear. The only other thing that I can think of is a misaligned hammer pin or sear pin hole in the trigger housing, but that is another far fetched possibility. But, I have seen that once!

[Pacifist86]

Well - took things back apart and tried turning the sear spring around to no avail. So, I put in an order for a new hammer, sear, and trigger spring.

I'll replace those one at a time when the parts come in and see how it goes.

Thanks again all!

[DaveHH]

Unlike the M1 rifle, the carbine sear and hammer can be oiled. I'd try that. That hammer spring is a powerful spring. Carbines are weird: My NPM fresh from CPM had a time when it was not moving the slide far enough to eject and cock the hammer, logic says that it was too strong on the slide spring or too weak on the piston. I replaced the spring with a new GI one and the problem went away.

[mmr61184]

Hi there I was referred to your posts from a different forum. I posted the same exact question and almost identical video that you did. My carbine is doing the same exact thing yours did. Were you able to fix it, was there any one specific cause if so

[painter777]

My carbine is doing the same exact thing yours did.

Except, Your Trigger Spring has a broken leg.
New Spring you'll be good to go.

See this Video and compare the movement of your Sear:

https://www.milsurps.com/showthread.php?t=17368

[Pacifist86]

I just got a package in today with a new hammer, sear, and trigger spring.

I replaced the hammer first and nope - didn't fix the issue.

Swapped back to the original hammer and replaced the sear next. BINGO!

Works flawlessly now.

Thanks all for your help in diagnosing this!

[Singer B]

I just got a package in today with a new hammer, sear, and trigger spring.

I replaced the hammer first and nope - didn't fix the issue.

Swapped back to the original hammer and replaced the sear next. BINGO!

Works flawlessly now.

Thanks all for your help in diagnosing this!

Congrats!!