One more addendum- if I rack the bolt and then ride it back down, I can get it to hang up about 20% of the way forward as shown below:

[Linked Image from live.staticflickr.com]

I don't seem to recall being able to do this with other AKs I've used. With the dust cover removed, I can release the BCG fully forward from this point by raising the safety to "above safe." It's also got the TAPCO trigger. Thanks again for any input!