-
Well, unfortunately the problem doesn't seem to be the ammo. I had several more malfunctions. With the Guat, they were mostly failures to chamber a round. It wasn't even bolt-overs this time, it was the bolt closing on an empty chamber, with rounds still in the inserted magazine. The top round in the magazine ended up looking like this:
http://dl.dropbox.com/u/9266193/2011...%20%282%29.jpg
Judging from the linear mark on top of the case, it doesn't even look like the bolt travelled far enough back to clear the case lip. Unless I'm reading that mark the wrong way.
With the HSM and Black Hills ammo, there was no problem chambering any of them after firing one off, but I had failures of the bolt to lock back several times with three different magazines- all in good working condition (two of them brand new Pmags). Roughly 30% of the time, the bolt would not lock back with an empty mag.
So now, it looks like I'll have to go through the proper channels to get this taken care of.
-
Well, that's unfortunate.
Look forward to seeing where this goes- this could potentially be the first I've heard of a BCM having a factory defect. I guess it had to happen eventually.
-
I would be curious to know what would happen with a standard carbine buffer? In any case I am sure you will be takenb care of.
-
I had considered dropping in a standard carbine buffer just to see. Actually, my other 2 ARs are 'builds', both 16", with mid-length gas systems, and both have standard buffers. With the same ammo and with that same steel magazine, neither have had similar problems.
I figure that something is still wrong though, because an H-buffer should work fine with a 14.5" carbine. I wouldn't be comfortable thinking that my carbine is the exception in a world where so many others successfully run the same system.
-
You don't have a Magpul BAD lever (or any similar contraption on your gun do you)?
Can we see a pic of the gun in question?
C4
-
-
Can't really tell from the pic, but is that rail free floating and or did you do any work on the gun (remove parts, add parts, etc)?
C4
-
That's a Knight's M4 RAS, which I installed. Everything I've done since getting the gun has been of a bolt-on nature except for the installation of the MOE grip. Otherwise, the BCG, the upper, and the complete lower are as-received.
-
what happens when you shoot several mags of the ammo with only 1 round loaded? Lock back?
-
With three different known-functioning mags, I did the one round test several times. It locked back on most of them, and came back to battery on the empty mag around 30% of the time. Mostly with the year 2000 headstamped Guat M193, but also with the newer HSM 5.56 and the BHBB .223 .