Non-Functional AK


November 30, 2008, 06:14 PM
Well, it happened again. I took my new Yugo M70 out to the range for the first time and whattya know, constant failure to fires' right out of the box. After every round I fired, the next one jammed. It wasn't the magazines, b/c I also used my friends mags and they didn't work either. I also oiled and disassembled the rifle before firing and everything seemed fine. Am I destined for another trip to the gunsmith?

btw, the only noticeable problem I saw was the bolt was a bit tough to pull back at first. It seemed as if there was some extra tension. Also, when the round jammed I was able to simply push the bolt forward to load the next round. Perhaps I need to completely strip the rifle and re-lubricate everything?

Any suggestions?

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November 30, 2008, 06:28 PM
Is it actually failing to fire?
Sounds like you're getting failures to feed to me.
You gotta be more specific about what's going on.

November 30, 2008, 06:31 PM
Yeah, I meant failure to feeds. The fired round ejects and the next round jams.

November 30, 2008, 06:37 PM
Did you totally disassemble, clean, and oil the gun after receiving it? Normally those things are packed in cosmoline. It sounds to me like it's short stroking.

November 30, 2008, 06:45 PM
Does it only fail to feed from one side of the magazine?
Meaning every other round would fail to feed?

November 30, 2008, 06:49 PM
I essentially field stripped it. I opened the receiver cover and oiled the recoil spring and bolt/bolt carrier, but I hardly touched the trigger or anything else. When the round jammed it appeared as if there was an obstruction in the bolt mechanics as I could manually slide the bolt forward and chamber a round. Should I strip it again?

November 30, 2008, 06:53 PM
If it happens on either side of the magazine I'd say it might have something to do with a poorly polished fire control group.
If you pull the bolt to the rear and gently allow it to move forward will it hang up on its own?
If so, I'd say try cycling the action about 500 times and see if that smooths things up any.

November 30, 2008, 06:53 PM
I somehow managed to fire an entire magazine without any FTFs (after several unsuccessful tries) but I honestly chalked that up to luck. The gun appeared to jam after every round regardless of the round's orientation in the mag.

Sam Cade
November 30, 2008, 06:56 PM
Misaligned gas block causing binding of the piston head in the gas tube perhaps?

Is the gas block perfectly square with the reciever?

November 30, 2008, 06:58 PM
Look at the magazine that did work and try to figure out what's different about it that made it work when others didn't.
Or, maybe your cleaning and messing around with the gun has done enough polishing to solve your problem.
Last, don't be afraid to work the action like you mean it for awhile. When you chamber a round, CHAMBER-THE-ROUND!
AK's sometimes need a little rough handling until they smooth up.

Also, don't Yugo's have the grenade cut-off on the gas block?
If so, make sure that's solidly put in the right position.

November 30, 2008, 07:02 PM
I think Sam Cade is right on about this,I had a AK do something similar and it turned out still some cosmo was in the piston tube and was partially blocking the 'gas tube',realy cleaned it out and problem was solved.Just for info on this... mine was (is) a M70AB2

November 30, 2008, 07:05 PM
Well, I just slowly pulled the bolt back and it got stuck. The first pull was also remarkably difficult but became easier on the next try.

November 30, 2008, 07:09 PM
Check the gas tube and make sure it's installed correctly. If it comes unlatched and flops around while you're trying to shoot or work the action it will cause headaches. That may be why you had trouble cycling the action.
If you still have problems, take the cover and recoil spring out and try hand cycling the carrier/bolt back and forth to see if you can determine where problem is showing up.

November 30, 2008, 07:17 PM
The bolt is showing alot of resistance when pulled, its getting nearly impossible to move. I'm going to strip it down. Is there anyway I can tell if the piston head is binding in the gas block?

November 30, 2008, 07:36 PM
i had that first i thought it was hanging up on the bolt...after smoothing and polishing didn't help....i got out the sharpee, and tracked it down to the side rails...a piece of 2x4 and a wack with a hammer spread the receiver and works fine...gpr

November 30, 2008, 08:02 PM
Funny you should mention the receiver. I am having a really hard time getting the cover back on. Even after managing to secure it to the frame, it appears as if it doesn't fit. Maybe that's the problem? I tried cycling the bolt without the receiver cover and it also appeared to have some trouble. Looks like I'll be shelling out some more $$ at the gunsmith.

November 30, 2008, 08:43 PM
You're remembering to press that annoying little button on the left side of the receiver,right? The one that only Yugos have ? Also, I've had problems with receiver covers not falling into place because the very back edge has bowed out an almost imperceptable amount. Press against it with something like the rubber covered handle-tip of a pair of pliers as you push the cover down into place ( of course, while simultaneously pressing the aforementioned "annoying little button".)

November 30, 2008, 08:47 PM
The first time I disassembled my WASR 10 it took me nearly 3 hours to get the cover back on. I'd totally disassemble it if I were you and oil all the moving parts.

Sam Cade
November 30, 2008, 08:50 PM
Remove the dust cover and bolt.
Remove the gas tube.

Examine the piston for unusual wear.
Examine the inside of the gas tube for unusual wear.

You need to find out exactly is binding and if it is as hard to cycle the action as you say it is there should def'natly be some visual clues as to what is going on.

Check to make sure the gas block is perfectly square with the receiver.

November 30, 2008, 09:11 PM
Oil the bolt lugs where it interfaces with the carrier. Sounds to me like it might have needed to break in some.

November 30, 2008, 09:43 PM
Thanks for the help everyone. I disassembled it and clean/lubed everything I could but the bolt still gets locked up if I pull it back slow enough. I'm sure I installed the gas block and bolt correctly, but even when I cycle it without the receiver cover it gets jammed. Could the bolt rails really be too close together and causing chaffing? This is very strange.

November 30, 2008, 10:41 PM
I'd say try to get around 300 rounds through that Yugo and see if it loosens up some when I first got my AK my bolt was so damn tight to put back in I thought I was doing something wrong took it to my buddy at work and he said it just needed a good break in. Anyways mine loosened up after the first few hundred rounds I put through it.

November 30, 2008, 11:49 PM
doubt its a problem with the gas piston binding as it sounds like its binding in the almost fully open position.
you could remove the bolt from the carrier and just install the bolt in the receiver to see if its binding on the lower rails, about the only place it could bind up on the lower rails is at the ejector on the left lower rail if the bolt slides freely back and forth by the ejector then would probably look at your bolt carrier and install just the carrier and see if it moves freely on the upper rails, have heard of some receivers that had a problem with the boltcarrier binding at the cutouts in the upper rails used for carrier removal when you have it all back together with receiver cover off see if the carrier is trying to engage those cutouts when it binds up it may just take some downward pressure on the carrier to reingage the rails and allow the bolt to close this problem is usually resolved with a buffer installed.

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