Man, i hope my R7R magwell is not a rock in magwell. That seems a little piontless. Since I F*&$%d up my 5 rnd mag trying to make it work with the R7R; I took a good look at it (the magwell) and the inside of front of the the magwell slopes all the way up to where it meets the reciever. Which, judging from the pics above the JT magwell does not. It looks like there is a straight section leading into the reciever, which i am asuming is what holds the mag in place once the front lug is removed. Any body have a solution that doesn't involve me spending another $150 bucks???