Ok, here is one that make wrack some brains. I figured it out, but it took a while. Let’s see what you guys come up with.
HDLS type comes in and says that his 14.5 Bushy is malfunctioning. While he was on R/R I had already replaced the gas rings, reamed the chamber, replaced the bolt carrier (he had one of those LMT “enhanced” POS’s in there) conducted a headspace check, and did a complete TI. Everything should have been good.
I ask him what it’s doing and what ammo he is shooting. He says that the bolt only comes back part way and the casing is sticking in the chamber. His weapon was also pretty dry. He said that he was shooting Lake City M855. I checked everything again and told him to give it another shot. He comes back 15 minutes later and says it’s still doing the same thing. At this point I am thinking gas tube or gas port is shot. Since we don’t have a borescope here I change out the gas tube and tell him try it again. I also gave him a different batch of ammo.
He comes back about 20 minutes later and says that it is still malfunctioning and there has been no change.
Anyone have any thoughts as to what the cause was?
Is the buffer binding or preventing the BCG from its movement in some way? Sounds like its not traveling all the way back and it should be if the gas system is 100%.
You said his weapon was pretty dirty. Did that have something to do with it? Also was there something blocking the rearward movement of the bolt carrier?
Ok, I won’t keep you guys in suspense much longer. Here is what happened.
HDLS type was not shooting M855 ammo as he claimed and as a matter of fact when I pressed him he couldn’t positively ID the ammo. I later determined that he was shooting Prvi Partizan 62gr. SS109 ammo. This ammo had been causing problems in our carbines previously (popped primers).
So essentially what happened was that a primer popped and went inside the bolt carrier key and when the bolt went forward the gas tube forced it all the way into the carrier key. I have never seen this happen ever and I was like WTF.
I told my wife about it and also told her to go buy 25.00 in lottery tickets because the odds of that happening are probably a million to one. If anyone is curious as to how tight a fit it is, try it sometime.
No, because the carrier that he had (LMT enhanced) was replaced weeks ago. This happened today while he was shooting with the BM carrier that replaced the LMT.
