PDA

View Full Version : BCM SBR blowing primers


Zane1844
08-17-18, 16:40
I have a 11.5" BCM with a Saker suppressor, and I have been having issues with it blowing primers. I have been using mostly Magtech M193, and Wolf Gold. It has only blown the primers of the Magtech ammo around 4-5 out of 500. I contacted them, they tested my ammo and had no issues. They are even sending me new rounds, which is awesome.

I have an LMT enhanced carrier and an A5 A5H4 buffer with Springco green spring. It has shot reliable with Wolf Gold, so that is why I was thinking it was an ammo problem.

So, what could be the issue here?
jesuvuah
08-17-18, 16:41
Does it only do it with the suppressor?

Sent from my SM-S327VL using Tapatalk
Zane1844
08-17-18, 16:52
Does it only do it with the suppressor?

Sent from my SM-S327VL using Tapatalk

Yes. I think I may have had one without it as well, but mostly suppressed. I also had one failure to eject/ blown primer.
jesuvuah
08-17-18, 16:54
I am no expert, but I did have a ar10 blowing primers only suppressed, and it was due to being overgassed and unlocking the bolt too early. With your setup it seems less likely to be that though.

Sent from my SM-S327VL using Tapatalk
Clint
08-17-18, 17:47
Overgassing can contribute to blown primers.
markm
08-17-18, 17:59
We've never had that type of issue with any of the 11.5 BCM barrels we've run. It may be a combo of the ammo and some other factor. It'd be interesting to run that ammo in another suppressed sbr.
tom12.7
08-17-18, 18:08
I would look at some different ammunition options to test out before I would make a change to the base gun. Making changes based on some economy plinking ammunition may not put you in good place if your usage may require something else later.
Zane1844
08-17-18, 18:29
I've fired a few, maybe around 100 or so, 62gr TBBC from Federal without issue. I have a mix of different .223 and 5.56 I can test it out with too. This will have to wait 4 months until I'm on leave though.
Iraqgunz
08-18-18, 02:42
I have shot thousands of rounds of Magtech ammo without issue. Most recently in some testing we did with our 11.5" and Silencerco Saker suppressor. No blown primers or other signs of overpressure.
CoryCop25
08-18-18, 04:24
Could be tolerance stacking....

https://www.m4carbine.net/showthread.php?187628-Please-Help-Me-Figure-Out-this-Problem&highlight=
vicious_cb
08-18-18, 07:41
Was magtech m193 surplus that came in sealed ammo cans or recent mfg?
Zane1844
08-18-18, 15:30
Was magtech m193 surplus that came in sealed ammo cans or recent mfg?

It was packaged in the yellow boxes, and made in 2014.


I have one shitty picture of one case. I wish I got them all.
RHINOWSO
08-31-18, 17:09
Sample size of 1, but my ELW 11.5" BCM with a Saker-K, A5H3 and Springco Rifle spring hasn't had any issues. BCM BCG as well.

Mostly shoot Federal M193 / M855, but also some MEN M193 (German made).