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Posted: 8/31/2003 1:55:28 PM EDT
Took my new SAR-2 (5.45x39) out to the range today. After I was done, while picking up the empties, I noticed about 90% of the casings had cratered primers and/or primers that were backing out. One in ten had splits on the necks. Fired around 200rnds- no problems with feeding or ejection. I've fired several thousand rounds of Wolf of various calibers, with no problems what so ever. If anything, I've found Wolf to be slightly underpowered rather than too hot. So what do you think? Headspace seems a logical guess. Anybody had similar problems?
Ok, this is the worst of the lot... notice the protruding primer. I'm going to try out some Barnaul and see if there is any difference. 
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Posted: 8/31/2003 5:22:34 PM EDT
[#1]
...dollars to doughnuts you got a headspace problem! Mine did the exact same thing. Borrow a set of guages, and bet you it has excessive headspace. If youhave had it less than a year send it back to CAI!
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Posted: 8/31/2003 5:31:19 PM EDT
[#2]
It probably is headspace, but I would try some Barnaul real quick just in case you have the first SAR to have an ammo preference.
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Posted: 8/31/2003 5:35:43 PM EDT
[#3]
Internet slowness = double post
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Posted: 8/31/2003 9:06:52 PM EDT
[#4]
I've had it less than two weeks.  Seems Century still can't build decent rifle. Anybody ever had to deal with Century? Hope it isn't a long, painful journey. Anybody have a No Go gauge I can rent? |
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Posted: 9/1/2003 4:54:38 AM EDT
[#5]
Actually I sent one back, and I think the turn around time was just a tad over 3 weeks. I was shocked! Just be sure that you inform them how dangerous the situation is, and that you mention "product liability suit" this seems to get them moving a bit faster.
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Posted: 9/1/2003 9:05:36 AM EDT
[#6]
it sounds like excessive headspace is the culprit here.
send it back. |
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Posted: 9/1/2003 1:28:30 PM EDT
[#7]
To piggyback on this thread:
Every round of Wolf and Barnaul I've ever put through my ORF/Bulgie 74 has had seriously cratered primers. However, as there are none of the other classic symptons of over-pressure present, and as the gun runs great, I have thus far chosen not to worry about it. Have I been reasonable or, do I have an impending problem I should worry about? Thanks, all. |
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Posted: 9/1/2003 5:35:51 PM EDT
[#8]
Every 74 bolt has a dished out area around the firing pin. Look at the bolt face and you will see it. Romy bolts hame it and Bulgy bolts have it.
I speculate this is a deliberate design feature to form a seal around the firing pin tip to prevent primer anlus from being blown back into the firing pin channel. |
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Posted: 9/2/2003 2:16:33 AM EDT
[#9]
My SAR2 does the exact same thing. The primer bulge is from the fireing pin hole like others said. I get a few split necks also. My buddies does the same.Its been a few thousand rounds between us both .No problems ....WD
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Posted: 9/2/2003 4:08:22 AM EDT
[#10]
primer flow with 5.45 is normal. ruptured cases are not. if it is splitting or tearing cases, send it back for repair.
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Posted: 9/2/2003 10:18:48 AM EDT
[#11]
So, who makes a No Go gauge for the 5.45? I bet there isn't a gunsmith in the five State area who has one.
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Posted: 9/2/2003 10:43:13 AM EDT
[#12]
gauges can be supplied by manson precision reamers or clymers (thru brownells).
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Posted: 9/2/2003 4:41:17 PM EDT
[#13]
I agree with the others. All of the 5.45 ammo that I have fired has exhibited primer flow and it does not seem to be a problem. It seems like the primer cup material is not quite hard enough to resist the presure of firing but, other than the obvious primer flow, everything works fine. However, if the whole primer *body* sticks out from the rear end of the case, you probably have excessive headspace.
This brings up another question. If an AK does have excessive headspace, how can this be fixed? The barrel is already drilled and pinned in the position that has too much headspace. The only thing that I can think of would be to press the barrel to the correct position using gauges and then redrill and use an oversize pin. Is this it? What can be done about excessive headspace? Thanks Drue |
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Posted: 9/2/2003 5:01:14 PM EDT
[#14]
drue,
That is one way, also pull the bbl fill in the pin notch, and reseat this time correctly. Also you can weld up the lugs on the bolt, and reduce it that way. Also try replacing the bolt. There are atleast 4 fixes..... |
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Posted: 9/2/2003 6:39:48 PM EDT
[#15]
The way I understand it, it is fixed by schoothcing the barrel back, drilling a new slightly larger hole in the barrel and trunion and re-pinning with the bigger cross pin.
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Posted: 9/2/2003 6:40:46 PM EDT
[#16]
I think that it is probably hot ammo. I have tried Wolf in 223 and 30 Russkie, and both have had slightly flattened primers. The same guns exhibit no symptoms when using US commercial ammo.
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