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Posted: 12/29/2006 9:26:30 AM EDT
[Last Edit: 12/29/2006 12:44:50 PM EDT by FloridaAKM]
I finished a Yugo M70AB2 slabsided build yesterday on a NDS-M92 receiver. This kit had a perfect barrel and 95% finish on the metal. After a trying build, i.e. MIGing additional material on the mag release to stop the mag from floping around, having to shorten the lower forearm wood .20 thousandths, replacing a long rear trunion rivet; I ran into the problem of the carrier not wanting to close all the way. Now, this is a matching numbers kit, so it was headspaced at the factory. I removed the bolt which let the carrier slide into place. I swapped bolts and carriers to no avail. I checked the length of the ejector which was .015 longer than a NDS-4 receiver. The bolt seems to be tight against the front trunion after the carrier stops. Looking at a functional Yugo, the bolt is still loose after the carrier group is locked up with no bullet in the chamber. I think I am looking at a headspace problem. What do you builders think????
Link Posted: 12/29/2006 11:26:13 AM EDT
on mine the right side lower rail didnt match up perfect with the right side of the truunion make shure thats not your prob

Link Posted: 12/29/2006 12:38:19 PM EDT
I will check it. I have watched you answer peoples problems for years, with the right fixes.
thanks for the reply.

Originally Posted By socandyman:
on mine the right side lower rail didnt match up perfect with the right side of the truunion make shure thats not your prob

Link Posted: 12/29/2006 12:44:17 PM EDT
Socandyman,
Nope, the right and lower rails line up perfectly. The bolt does not seem to be turning the last 2 to 5 degrees to achieve lock up. If I had a round in the chamber, I would say I have less than normal headspace. This one has me puzzled.
Link Posted: 12/29/2006 12:54:36 PM EDT
Link Posted: 12/30/2006 8:31:31 AM EDT
The bolt will not close at all, so I can't check the headspace. Yes, I assumed that the kit was headspaced at the factory correctly.

Originally Posted By dalesimpson:
Did you check the headspace, or are you just assuming that because it is a matching kit that the headspace will be correct?
Link Posted: 12/30/2006 9:15:21 AM EDT
Link Posted: 12/30/2006 10:01:52 PM EDT
Pics would be helpfull in determining the problem.

FREE
Link Posted: 12/30/2006 10:50:17 PM EDT
barrel in to far(headspace)....i had a romy kit like that...looks as if the barrel pin was drilled the first time not headspaced so they pressed it out and redrilled from the factory that way

most will be correct going right back together but sometimes there are problems even w/ matching # kits so u got to check them!
Link Posted: 12/31/2006 12:04:34 AM EDT
your headspace would have to be way way off for this to be a headspace prob
so much that i would look in other places first

so start with checking the feed ramp (make shure its in correct and not loose)

then look for burs or crud in the trunnion


let us know if you find anythang there


PS on most the standard trunnion yugos ive seen 1/2 the parts dont have #'s so its kinda hard to tell if its a matching kit or not

Link Posted: 12/31/2006 6:08:48 AM EDT
I did some closer checking:
The feedramp is not loose, it is in tight & matches the rails.
The trunion is clean with no burrs or crud.
Using another rifle, the bolt closes easily, the bolt wiggles freely, and the carrier finishes closing not affecting the bolt.
On the affected rifle, the bolt contacts the face of the barrel and everythind stops, the bolt is tight against the barrel and can go no where else.
The serial # on the receiver ( there were no numbers on the trunion) matched all the numbers on the rest of the kit.
I am going to remove the barrel pin and try to press the barrel out a small amount to see if this will allow the bolt to close. Then I will have to get a set of gauges to safely check /set the correct headspace.
Thanks for all the help with this problem. I will repost when I finish!

Originally Posted By socandyman:
your headspace would have to be way way off for this to be a headspace prob
so much that i would look in other places first

so start with checking the feed ramp (make shure its in correct and not loose)

then look for burs or crud in the trunnion


let us know if you find anythang there


PS on most the standard trunnion yugos ive seen 1/2 the parts dont have #'s so its kinda hard to tell if its a matching kit or not

Link Posted: 12/31/2006 7:52:19 AM EDT
Link Posted: 12/31/2006 11:42:51 AM EDT
yea it does its just not that commin
i guess i was just hoping for an easyer solution


Link Posted: 12/31/2006 12:25:50 PM EDT
Link Posted: 12/31/2006 5:11:56 PM EDT
Update;
The barrel is pressed in too far by several/many thousandths of an inch. By pressing the barrel back out, the bolt & carrier closes as a normal operation. I still need to properly headspace this build before redrilling the barrel pin. I am relived to know that I didn't screw up the build.....

Originally Posted By dalesimpson:

Originally Posted By socandyman:
yea it does its just not that commin
i guess i was just hoping for an easyer solution




Me too brother.  I have never seen one with headspace that tight, but according to what the OP states, he has the tightest headspace ever.
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