Went to the range yesterday and was putting my BCM midlength through its paces. It has a BCM BCG (FA) and an H buffer. It is usually 100% reliable.
I was using Magpul Pmags and Brownells 30rnd mags with Magpul followers.
I was shooting Ultramax 75gr BTHP match .223 ammo.
I was using plenty of lube (Slip 2000).
When the malfunction occured, at first I thought it was a Failure to Feed, racked the gun, and BCG did not close home, at which point it looked like a double feed.
When I dropped the mag and locked bolt open, I discovered something very odd, I had 1/2 of a brass case wedged atop the round that was still partly protruding from the chamber. This 1/2 a case was shorn in two (about a third of the way up the cartridge from its base and the cut was perpendicular to the length of the cartridge, not lengthwise). Upon pulling the other round from the chamber, I discovered the other missing half of the previous case had still been in the chamber and it came out with the full cartridge I pulled from the chamber.
I Will try to post pics of the case later tonight, but I thought it a very bizarre malfunction for a casing to be shorn in two inside the chamber, the back half had extracted and the front half remained in the chamber so that the next fed round pressed in on top of and inside the front half of the old case.
I have looked the BCG over and nothing seems to be broken. Could this have been an overpressure round? What else could cause a case to cut in two IN the chamber like that?
I carefully looked the rifle over before attempting any more shots and made sure there was not a squib up the spout. the rifle functioned fine for the rest of the 50 rnds I had left using the same ammo as before.


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