Mosin-Nagant rimlock

irRegularGuy646

irRegularGuy646

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I got a 91/30 Mosin-Nagant from FOC as one of my first guns more or less 2 years ago, still in the cosmoline. It came with a myriad of issues that I've since mostly solved, but the one problem I haven't managed to fix yet is how it still gets rimlocked when I load from stripper clips. It works just fine when loaded one by one because it's basically impossible to get the rims behind eachother accidentally, but I want to be able to use stripper clips. I've tried adjusting the follower angle, I made sure the stock isn't interfering with the ejector-interruptor, I've tried filing on the ejector-interruptor, etc. I just can't seem to figure out what's causing it to jam. the interruptor is holding the second round back just fine but it's like it isn't holding it far down enough or the magazine spring is just pushing the rear of the rounds into eachother. As of now, pounding the hell out of the bolt is about a 50/50 for either ejecting the top round out of the magazine somehow or chambering it after gouging a line of copper wash off of the second round's case.
At this point do I spring for that anti-rimlock "HV" mag and replace the magazine base plate and the interruptor-ejector?
 
JP said:
If you are using the cheap chinese clips on the market right now, that could be your problem.
Click to expand...
Well, a couple things
1. I don't really see how the cheap clips could "cause" rimlock. the interrupter is supposed to make that impossible regardless of how the rounds make their way into the magazine
2. I modified mine to work the way that I read that the original/good quality clips are supposed to, as in fitting very loosely to the point that some bounce back from the follower spring is enough to spit the clip out automatically after loading sometimes
 
Theoretically the interrupter should keep them seperated.

Practically I have found it to be the not most reliable way of avoiding rimlock (i.e. doesn’t work the best). I think it is just a design flaw/manufacturing issue with some.

I haven’t tested every mosin I have owned on it as I just load my stripper clips a specific way and that makes it a non-issue, but I do recall before loading that way it would occasionally have problems.

The way I load stripper clips is making sure every rim is behind the other, this means it can only be inserted one way, looks something like this.

\\\\\
 
Eaglelord17 said:
Theoretically the interrupter should keep them seperated.

Practically I have found it to be the not most reliable way of avoiding rimlock (i.e. doesn’t work the best). I think it is just a design flaw/manufacturing issue with some.

I haven’t tested every mosin I have owned on it as I just load my stripper clips a specific way and that makes it a non-issue, but I do recall before loading that way it would occasionally have problems.

The way I load stripper clips is making sure every rim is behind the other, this means it can only be inserted one way, looks something like this.

\\\\\
Click to expand...
I've heard about that method and it works, but the problem is it's hard to make sure the clips stay that way especially if they're being bounced around in a pocket or chest rig. the clips have trouble holding the rounds in at all if you shake them so i don't have much confidence in their ability to keep a few millimetre wide rims in the correct alignment.

Do i just go and find a replacement interrupter?
 
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The clips I have hold them pretty solidly. The originals I have (Brass Chinese) also hold solidly. That might be part of your issue.

As to getting a new interrupter, you haven’t identified what exactly is causing the issue in the first place. Without figuring that out changing parts isn’t necessarily going to resolve it.
 
Take the interruptor out and clean it and the channel it’s in. Mine would shoot the entire contents of the magazine out on the first outing after I cleaned it. Cosmoline gummed up some stuff not so much a problem now. My cleaning method for cosmoline removal on new guns is to take a 2 inch or so pvc pipe long enough for the barrel/action and a cap fill the pipe up with mineral spirits and let soak for a while then scrub.
 
irRegularGuy646 said:
I got a 91/30 Mosin-Nagant from FOC as one of my first guns more or less 2 years ago, still in the cosmoline. It came with a myriad of issues that I've since mostly solved, but the one problem I haven't managed to fix yet is how it still gets rimlocked when I load from stripper clips. It works just fine when loaded one by one because it's basically impossible to get the rims behind eachother accidentally, but I want to be able to use stripper clips. I've tried adjusting the follower angle, I made sure the stock isn't interfering with the ejector-interruptor, I've tried filing on the ejector-interruptor, etc. I just can't seem to figure out what's causing it to jam. the interruptor is holding the second round back just fine but it's like it isn't holding it far down enough or the magazine spring is just pushing the rear of the rounds into eachother. As of now, pounding the hell out of the bolt is about a 50/50 for either ejecting the top round out of the magazine somehow or chambering it after gouging a line of copper wash off of the second round's case.
At this point do I spring for that anti-rimlock "HV" mag and replace the magazine base plate and the interruptor-ejector?
Click to expand...


 
irRegularGuy646 said:
I got a 91/30 Mosin-Nagant from FOC as one of my first guns more or less 2 years ago, still in the cosmoline. It came with a myriad of issues that I've since mostly solved, but the one problem I haven't managed to fix yet is how it still gets rimlocked when I load from stripper clips. It works just fine when loaded one by one because it's basically impossible to get the rims behind eachother accidentally, but I want to be able to use stripper clips. I've tried adjusting the follower angle, I made sure the stock isn't interfering with the ejector-interruptor, I've tried filing on the ejector-interruptor, etc. I just can't seem to figure out what's causing it to jam. the interruptor is holding the second round back just fine but it's like it isn't holding it far down enough or the magazine spring is just pushing the rear of the rounds into eachother. As of now, pounding the hell out of the bolt is about a 50/50 for either ejecting the top round out of the magazine somehow or chambering it after gouging a line of copper wash off of the second round's case.
At this point do I spring for that anti-rimlock "HV" mag and replace the magazine base plate and the interruptor-ejector?
Click to expand...

Hello,

Rimlock may be caused by a few things. First, the Russians didn't really fit new parts when they refurbished them, and you may need to tension the ejector spring, which also serves as the interrupter. Bending the "nose" that contacts the rounds inward can help, too, but don't go overboard: It's possible to bend it far enough that it won't allow the next round to rise.

Another issue is compressed wood: If you overtighten the action screws, the stock will compress. Don't go more than 15-20in-lbs without installing pillar bedding.

Third, the stock may just be badly fitted. If this is the case, shims should help.

So:

1. Tension the ejector spring; bend nose over slightly.
2. Add shims to the action at the action screws.
3. If you're not a purist, add pillar bedding; improved feeding may be a byproduct.

Additionally, an HV magazine from a Finnish Mosin will help greatly if combined with 1&2 above. Regrettably, I cannot sell these to folks in Canada and so I can only hope that you can source one up there.

Regards,

Josh
 
I've always got Mosin parts from e-bay sellers in Finland, Estonia, etc. They don't seem to have the restrictions facing Americans. For those not familiar with Mosins, the shims being referred to are the ones very commonly seen on Soviet 91/30s—on the underside of the stock, in the channel for the magazine assembly. They position the magazine relative to the receiver without affecting the bedding of the barreled action in the stock. Originals I've seen were typically galvanized steel.

milsurpo
 
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