Ran a couple boxes through my buddy's shorty 9mm AR, not a single malfunction...
I've also fired quite a bit of the .45 through various pistols, and they all liked it just fine. It's a little dirty, has an odd aroma, but beyond that, it's good to go.
I've never had a problem with any of the "Bear" ammunition, in any caliber, and I've probably fired at least a five thousand rounds of it.