I did a search for this and was not able to locate anything particular helpful. Most of the threads/posts are referring to the 14.5" Mid-length which I do understand is not reliable with crappy steel cased ammo. So, yeah, sorry if it has in fact been covered!
To give you a little background, the rifle I'm running is:
16" BFH LW Mid-length BCM Upper
BCM Complete BCG
BCM Complete Blemished Lower (from Grant) with the standard H Buffer, etc.
Everything else is BCM including charging handle, etc, etc. In short, it's a quality BCM rifle.
I took it out for the first time and fired about 100 rounds of M193. Accurate as shit, feeds reliably. Sweet.
Next up, I put in the 62 grain Golden Bear hollow points I had a box of. The first one fired fine, but the first one fed from the mag itself would cause a failure to feed. I tried it a few times and it happened exactly the same way every time. I had to take my rifle apart and remove the BCG to get this oh-so-high-quality piece of ammo unstuck. boy, I'd hate to have to go through that in a self defense situation.
Golden Bear is obviously not great ammo. It's supposed to be "premium" Brown Bear ammo, I believe. It's steel cased ammo with a "brass coating" for reliable feeding. Yeah. Right. Anyway, I gave up on the Golden Bear hollow points and threw some more of the M193 in it.... Surprise! It functions fine.
At this point, I'm going to purchase one box of each steel cased brands out there (Brown Bear, Silver Bear, Tula, Wolf, etc) and see how those function. Has anyone else had issues with steel cased ammo specifically in a 16" Mid-length BCM? Again, I understand crappy ammo in the 14.5" is problematic but I purchased the 16" specifically for the fact that it's supposed to feed all kinds of ammo.
I understand I'll be putting crappy ammo in my BMW of AR's and everything; my main concern is that in a SHTF situation, I want to be able to fire whatever is available to me after I run through all of my NATO ammo. Beggers can't be choosers, right?
FYI: 'problem' was resolved after running around 500 or so rounds of full power 5.56 through the weapon, I no longer have short stroking issues with steel cased ammo.



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