Mossberg 351k

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G-Force24

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Nanaimo B.C
Hi guys,
I'm looking at a friends mossberg 351k (semi, rimfire) he had said that it has failure to feed and extract, so I tear it apart. I find that the firing pin had broken at the rear where it hooks into the back of the bolt, so I clean the heck out of it, inspect the mag lips (good), check for burrs in the camber (all good) so I put it back together (minus firing pin) load dummy rounds into the mag, and start with the operating cycle, after a couple single crisp racks of the bolt, no load into the chamber, so I do repeated racks rapidly, after about 8 times, it loads, but now it will not extract, it takes many more repeated cycles to get it to extract. An INSANE amount.
I've googled this firearm, and there is really not that much info about them out there, except for a useless to my purpose video on youtube.

Any advice? am I on the right track?
 
When you cycle it manually, are you "easing" the bolt back n' forth? To test these properly, the bolt really must be cycled sharply. Let the bolt snap back from the rear position. Not sure if "dummy rounds" will cycle through it happily regardless

For feed issues, cycle the bolt slow enough to see the round "squirt" into chamber. My 51M was a tube fed model, and rounds were "free floating" in the chamber for a moment in time. Squirted from mag to chamber than "pushed home" by bolt. The bolt didn't actually collect the round, just toggled the cartridge cut off. Check your cartridge cut-off and, spring. Make sure mag is aligned, and don't over-torque the take-down screw. The magazine is part of the stock and, only held it doesn't take much to make it finicky.

For extraction issue, again, be certain the bolt slams home. It may have troubles with dummy rounds too. Double check your extractor and, spring.

I have 352K with a broken firing pin (popular issue with these...Mossberg changed the hammer/pin combination to a beefier setup). I love the Mossbergs of this era, but have a hard time understanding the "motivator" in keeping the firing pin in the hammer to cycle. Very little torsion breaks the pin...the pin itself prevents the torsion.

For what it's worth...these are accurate .22's.
 
Its a rear tube mag, and when I stripped it, I took the spring set and follower out, and both parts of the mag worked, I tried with live ammo ( just the mag set up in the stock, no receiver) and when I push on the release all the rounds fling out faster than I can count. My theory is that there is something stopping the catch in the mag from depressing upon release of the bolt. Then with no firing pin installed, I now tried it with live ammo, same result...........
When I cycle the action manually, I try and do it, as crisply as would happen under field conditions. its starting to bug me lol
 
Don't know why it stopped extracting - but if you fire live ammunition, the spent case is going to come out of the chamber.
When you install the replacement firing pin make darn sure it fits properly. If the bolt closes with the firing pin protruding from the boltface.....
 
Almost there

So, I've got it loading fine now, but it still will not extract. After removing the bolt assembly I find that there is a little play in the extractor (no spring pressure) only for about 1 mm. I think that's why it is not extracting, it does not have the pressure to purchase itself against the cartridge rim.
Of course being very gentle, needle nose pliers to stretch it a tad????
 
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