M39 cycling problem

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Federico Tyrawskyj

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Hey guys,

I just disassembled the bolt of my m39 and I've been doing a couple of tests on it since I experienced some "sticky bolt" problems last time I went to the range (I had to hit the bolt pretty hard to get it opened after 4-5 shots, probably cosmoline at that point). So, I'm home, and I try loading an empty cartridge (empty wolf 200 gr. bimetal sp.), and it's PRETTY damn tough to close the damn bolt, and once it's closed, it's even harder to open it! It can't be cosmoline since the gun is cold, unlike in the range. I haven't tried loading a live round in it and I won't be able to until I go back to the range. So, could this be due to the fact that I'm trying to load empty cartridges, or could there be some damage to the bolt? The rifle cycles just fine without rounds. Oh, and I also noticed some very slight dent on the bolt head , although the spend cartridge fits just fine in it once I pop it in...

So, what could this be???
 
Your problem are the fired rounds they expand after firing. Also do a super cleaning job to remove all traces of cosmolene in the chamber, old cosmolene hardens like glass.
 
i wouldn't loose sleep over it. sounds like your chamber has cosmoline in it that heats up after a few shots. and with a dirty chamber and fired steel cases, it is no surprise you can't chamber the fired cases.
 
"...chamber has cosmoline in it..." If it does, the rifle needs that removed post haste. It's more likely to be a headspace issue.
 
Headspace uh? I'm gonna have to get my hands on some of those headspace lugs with the go and no go marks. Alright, I'll check that out and let you guys know. Thanks!
 
JP said:
Your problem are the fired rounds they expand after firing. Also do a super cleaning job to remove all traces of cosmolene in the chamber, old cosmolene hardens like glass.
Click to expand...

I'll see if the problem reappears once I load live rounds. It may be only that too.
 
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