Quote Originally Posted by bryjcom View Post
I think if you permanently modify the mag to accept no more than 15 rounds then you could sell it.

For instance you you used a rivet to block the follower from traveling down then that would be a "permanent" modification, right? Since it would need special tools to remove such a rivet?

But if you use a screw then it becomes a temporary modification as a screw is "readily" removed and the mag is converted back to evil status.

Just thinking out loud.
The floor plate must be made no longer removable. either epoxy, pop riveted, or spot welded. depending on the magazines material composition. One company is using spacers to block to 10 rds then crimp and epoxy the floor plate, on Pmags They are CA Compliant.