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 noob5000000 
Member
Joined: May 2010  MI, USA
 Posts: 102 Feedback: 0% (0) |
Posted: 8/5/2012 7:12:24 PM
[Last Edit: 8/5/2012 7:14:30 PM by noob5000000]
THE IMAGE ABOVE IS A PAID ADVERTISEMENT When shooting brass cased Yugo surplus ammo, I'll get quite a few cases stuck in the chamber. I have to beat on the charging handle to get it to eject. Other times, I'll get cases that don;t make it all the way out of the ejection port and get jammed between to bolt and barrel or trunion (pics below). Steel case ammo works fine. My theory is that it stems from a tight chamber. Since brass case ammo expands more, I can see how cases could get stuck if the chamber is kind of tight. I was baffled by my incomplete ejection problems before, but now I think it's related. My theory is that some cases don't expand enough to get stuck, but they expand enough to slow down the bolt carrier as the extractor rips them out of the chamber. Maybe this could suck enough energy out of the carrier to prevent it from cycling back all the way, therefore causing it to close earlier before the case can completely clear the ejection port. Does this make sense? Is there still enough gas pressure in the gas tube after unlocking to make this theory invalid? What can I do about a tight chamber? I've cleaned it thoroughly and even put some polishing compound on a patch and spun it around a few times but brass cases still get stuck. I've read that reaming a chrome-lined chamber can cause the chrome to flake off. EDIT: forgot the picture They'll either get stuck there or against the back of the barrel. 
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Posted: 8/6/2012 1:37:46 AM
Are you shooting brass cased right after shooting steel cased?
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Posted: 8/6/2012 7:34:28 AM
Have you had this problem with any other brass case ammo? Have you tried any other lots of yugo surplus? How rounds do you go through before this malfunction occurs?
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Posted: 8/6/2012 8:45:41 AM
Your carrier is to tight in the chamber ''tight headspace'' and or the chamber is to tight or dirty. These are the reasons a brass case will stick. Opening up the headspace will likely fix it either way.
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nictra
Member
Team Member
Joined: Feb 2007 TX, USA
Posts: 5826 Feedback: 100% (56) Link To This Post |
Posted: 8/6/2012 9:01:00 AM
get some bore scrubber and clean that bore like no ones business. If it's still sticking then you might have a tight headspace issue.
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Posted: 8/6/2012 11:09:45 AM
Polish the chamber after giving it a good scrubbing. Polishing compound on a shotgun mop on the end of one of those dremel flexible cable attachments. You could also polish the bolt rails on receiver and the area of the hammer where the bolt rubs against it on recoil. |
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Posted: 8/6/2012 11:12:35 AM
Clean the whole rifle really good? Try different ammo? If that doesn't work, send it back to Century arms.
Originally Posted By HWI:
Are you shooting brass cased right after shooting steel cased? In a properly made AK, that shouldn't make a difference. |
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Posted: 8/6/2012 7:16:21 PM
Originally Posted By HWI:
Are you shooting brass cased right after shooting steel cased? Not in the most recent case (this weekend). I only had Yugo brass case. Originally Posted By fatcat4620:
Have you had this problem with any other brass case ammo? Have you tried any other lots of yugo surplus? How rounds do you go through before this malfunction occurs? The Yugo surplus is the only brass cased I've used. I've used several lots over time, it happened less some times, but never 100% absent. Originally Posted By bigjunk1:
Your carrier is to tight in the chamber ''tight headspace'' and or the chamber is to tight or dirty. These are the reasons a brass case will stick. Opening up the headspace will likely fix it either way. How can that be done? Originally Posted By nictra:
get some bore scrubber and clean that bore like no ones business. If it's still sticking then you might have a tight headspace issue. It's pretty dang clean. But I'll clean it some more. Originally Posted By Mak:
Polish the chamber after giving it a good scrubbing. Polishing compound on a shotgun mop on the end of one of those dremel flexible cable attachments. You could also polish the bolt rails on receiver and the area of the hammer where the bolt rubs against it on recoil. I've polished the chamber a couple times with Mother's 'Mag & Aluminum Polish'. Should I be using something else? Maybe even try something really aggressive like valve grinding compound followed by a polishing compound? I'll hit the rails and hammer a litle bit. Originally Posted By Ermac:
Clean the whole rifle really good? Try different ammo? If that doesn't work, send it back to Century arms. I wish I had a chance to shoot more often so I could really diagnose the issue. I can't remember ever having a problem with steel cased ammo, though. Would Century give me a hard time if I polished the chamber and then sent it back if the issue didn't go away? Also, I forgot to mention that ejection is kind of inconsistent. Sometimes cases will go flying 25 feet, other times they'll kind of tumble out of the ejection port. This kind of fits in with the 'carrier slowing down' theory  .
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Dawg180
Student of the Assault Rifle
Team Member
Joined: Dec 2002 IL, USA
Posts: 16079 Feedback: 100% (152) Link To This Post |
Posted: 8/7/2012 5:15:02 AM
Get some 7.62 bore cleaner- stuff smells nasty and don't get any on you but will dissolve just about any crap that gets in a gun. Put in the chamber, let sit for a bit (10 minutes or so). Use a brass brush for a 12 gauge shotgun and clean the chamber that way. Then try shooting brass case.
Is it only Yugo brass cased that won't work? |
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nictra
Member
Team Member
Joined: Feb 2007 TX, USA
Posts: 5833 Feedback: 100% (56) Link To This Post |
Posted: 8/7/2012 9:07:14 AM
I've had bores "look" good only to be real nasty when you put the bore cleaner in there. Start with the cheap fix 1st before you thinking about having that headspace reworked.
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haydendavid380
Rock's out with his Glock out
Team Member
Joined: Jan 2010 IN, USA
Posts: 6421 Feedback: 100% (27) Link To This Post |
Posted: 8/7/2012 11:12:56 AM
Originally Posted By Ermac:
Clean the whole rifle really good? Try different ammo? If that doesn't work, send it back to Century arms. Originally Posted By HWI:
Are you shooting brass cased right after shooting steel cased? In a properly made AK, that shouldn't make a difference. Brass will expand further than steel. Steel tends to be dirty. After the chamber is fouled and you fire a brass cased round, the brass case can expand and get stuck. it can happen even to the most properly made AK's. |
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Posted: 8/7/2012 3:33:06 PM
Originally Posted By Ermac:
In a properly made AK, that shouldn't make a difference. I cannot agree with this. Regardless of build quality, shooting brass cased after shooting steel cased still has the possibility to cause issues, |
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Posted: 8/19/2012 1:05:08 PM
Where in Michigan are you ? it could be you have an extractor issue.
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