Well this adapter has about 4k rounds through it; mostly 5.56 but also 7.62x39 and 300blk. Majority of the rounds where shot in one of Travis Haley's carbine class and no issues/malfunctions through those 4k rounds.
Since I got this adapter I have thought about seeing if I can get this to work on my 9mm upper. Those that have a 9mm upper know that the BCG is different from a standard BCG.
You can't stick the LAW adapter BCG insert in the back of a 9mm bcg. Or so I thought. Upon closer inspection, you can see the bcg rear is not a solid one piece. Instead the center is held in place by a roll pin.
Upon remove the roll pin, it let me remove that said piece. I than cut off enough of it off(appox. 11/16in.) so that I can still reinstall it and use the roll pin.
After putting the center piece back in the bcg, I measured off how much I have to cut on the LAW adapter insert.
Haven't shot it yet but I don't see why it wouldn't work.
rear of 9mm bcg unmodified
modified LAW insert
bcg and insert
suppressed 9mm