C'mon, if they were they would bring them in by the carload. It is not a PISTOL mag it is a CARBINE mag. When I was dealing with H Y C A P S, I sent him picks of it and everything and he would not pin the mags to 10. He even inquired about them to RRA and they had no idea of there existence. I am not telling people that they are prohib devices but it just seems a little sketcy. If they are 100% then bring some more in, but even the uzi pistol mags modified for AR were not legal to pin to ten or Riley would have done it for I think $60 apiece. What would the diference be if you marked a promag LAR and pinned it to ten? I just think they made some and then sombody said "wait a minuite, that's not right, we will let these slide by but don't do it again" Maybe somebody from Questar can chime in and let us know why those mags are "unobtainium" Because I'm sure it's not that there is no market for them.