CZ 527 headspace issue...

[chaseguitar]

I've got a CZ 527 carbine in 7.62x39 that I was shooting yesterday afternoon when I noticed something. I was sighting the gun in, first using some inexpenisve wolf ammo to get in the zip code before switching to winchester power points which is what i'll be using when I hunt with the rifle. The issue came with the Winchester ammo...I had several FTFs with it. I had to pull the trigger three times on one of the rounds to get it to fire....and when I looked at the spent brass I noticed that the primers were backing out. A guy I was shooting with, and my dad for that matter, said I have a headspace issue...my question is, could it be an ammo issue....? The wolf gave me no problems whatsoever...any ideas....?

 

[rangerruck]

it could be either, but def something is pushing that round back, another possibility is ; the wolf left some lacquer in the chamber, and when it dried on your nice brassy winnies, it is pushing it back.

 

[stubbicatt]

I would disassemble the bolt, and check the area around the firing pin aperture. I have read where with some of the Wolf ammo, flakes of metal come off the outside of the primer, and tend to clog the firing pin aperture.

To disassemble the bolt, take the bolt from the rifle, and "uncock" it by turning the cocking piece until the tension is off the striker spring. Then remove the bolt handle from the bolt body. From here it is easy to unscrew the striker assembly from the bolt. Peer down into the cavity and see if you see any metal flakes in there. Perhaps give it a squirt of brake cleaner (nonchlorinated) or two to loosen up any residue. I'll bet tiny little elliptical pieces of brass colored metal are dislodged during your endeavour.

Examine the firing pin tip for any damage, and if none is present, reassemble.

While I'm not a gambling man, I'd bet this is your issue. Headspace on the CZ rifle is traditionally on the "tight" side, and I suspect yours is no different. Even if it were "loose", the claw extractor would hold the case head close enough to the bolt to initiate the primer.

If you have the proper tools to gage firing pin protrusion, perhaps uncock the bolt and take a measurement before and after. I'll be interested in following this topic for more information.

HTH!