If you're looking to add functionality with this, especially in use with a Redi-Mag or Redi-Mod, I highly recommend the
BCE Comp Model as it falls right under the thumb after you retrieve the spare magazine and insert it into the magazine well, exactly as shown in the picture in the link. BP considers this a competition version, and I suppose one could argue that the hook design may get caught on things in "real world" applications, but with the body of the RM in the way I don't see that as any kind of major concern.