I did pick up one of DD's mag locks, along with an extended rear pin, and pinned to 10 30 round mag...IF I decide to keep my M4gry in state, I'll swap parts (of course keping the old parts for when I get out of this shithole), and have a non-detachable mag M4gry that still looks like an M4gry.
Not a perfect solution, but it doesn't have to be registered, and I can take it out and shoot it....
Not bad to have the parts in the back pocket.....
Talked with Dean quite a bit about it, he has talked extensively with the SP idiots...they said his mag lock will satisfy the law, but of course no paperwork or letters....YMMV, but it seems like the best "compliant" fix to me. I looked at/tried those whacky looking banana handle no stock things...didn't FEEL too bad, but, man, just plain fuggly. As I said, I'd rather have the fixed mag solution....