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Did my Model 60 go full-auto?

7.3K views 13 replies 6 participants last post by  Marlin60Man  
#1 ·
Okay, so I made the topic about my action creeping in the stock, but I kind of thought maybe just make a new one about this since I have a video of this weird malfunction I had. Happened right after my trigger failed to reset. I ejected the chambered shell to get it reset, and then had what seemed like a moment where the gun went full-auto and fired two shots before the last-shot hold tripped. Forgot that my fiance was taping until I went through my videos...

 
#3 · (Edited)
Yeah, I wonder if there's a way to slow the video down. It does look higher quality on my camera than what it turns out on YouTube...

I kind of worry about it because if there's something funky going on with the trigger-disconnect, then couldn't that mean the potential for making it go full auto like this?

Edit:

I managed to figure out how to bring the frame rate down to 2.5 fps and I think I can see two shells coming out at the same time at the end...

 
#5 ·
Probably should assume that it did double fire, and get to work on diagnosing that. First thing to check is that the disconnector moves freely up and down. The second thing to check is that the bolt (in it's rearward position) actually pushes the disconnector far enough down to disengage it from the seer. It's possible that the top of the disconnector has worn down (or was filed down by someone who wanted a full auto .22) to the point that it isn't always disconnecting. If the disconnector is working properly, holding the trigger back will not cause multiple shots to be fired.

Third is to carefully inspect the seer to hammer engagement, and look for wear. Specifically look for shiny silvery metal, and rounded off corners. Again natural wear or modification could cause these parts to not properly engage, or not stay engaged.

The last thing that I know to check is the chamber itself. make sure that the breech, and breech bolt are clean and smooth and free of burrs or other damage that could deform the rim of the cartridge and set off the primer. Make sure that the firing pin moves freely, and fully retracts beyond flush with the bolt face.

There's probably more, but that's the limit of my knowledge on the subject.

Good luck. Be safe.
 
#6 ·
Okay, I took it down and checked most of that svrider. As far as the sear and hammer goes, I did notice that there was quite a lot of oil and debris stuck to it where the little groove in the hammer is from my last cleaning job. Do you think that may have kept the sear from keeping the hammer back, and maybe the double fire was from hammer-follow?

Everything else looks good. I checked the disconnector right off and it seems fine, no visible wear and it disconnects the trigger when the bolt is locked back.

Not sure what you mean about the breech and the breech bolt though... But I checked the whole barrel/chamber/rim area for dents/burrs and the face of the bolt where the shell sits, and all looks well.
 
#7 ·
Do you think that may have kept the sear from keeping the hammer back, and maybe the double fire was from hammer-follow?
That was what I was thinking, yeah.

Not sure what you mean about the breech and the breech bolt though... But I checked the whole barrel/chamber/rim area for dents/burrs and the face of the bolt where the shell sits, and all looks well.
Yeah, that area is the breech.

With any luck, it was just the crud in the hammer/sear area. What we really need is Big Shreck's opinion.
 
#10 ·
No real progress so far, I've done about all I can do to inspect it without actually going to go shoot it, and it seems okay. Gave the action a much more thorough cleaning than before, checked out the disconnector and making sure it was... Disconnecting. Firing pin looks fine, moves freely.

I think that hammer-follow is the only thing that could have happened
 
#11 ·
Okay, well, I took it back out shooting today.

I think this problem has something to do with my trigger also not resetting every once in a while. Not really sure what is going on there, but in the middle of trying to trouble-shoot it I was only loading two shells to see if the trigger would reset and allow me to fire semi-auto... Well, after loading two shells, I pulled the trigger once and noticed an unusually strong recoil. Looked down and the rifle was out... So it seems it did it again, though this time it was so fast I really didn't notice the double report.

Not really sure what I did, but after taking the gun down and checking out the action and dis connector, I placed the receiver as far rear into the stock as I could, and tightened down the screws. Afterward it was smooth sailing except for one time the trigger failed to reset again.

So I really don't have a clue what is going on... Everything looks okay. The only thing that looks abnormal is the buffer, it looks like the little circle in the middle has been collapsed into an oval shape...

Maybe I should just send it in for warranty work?