Bob, I've only seen one RF Striker in .22 mag and one in .17HMR. That was 3 or 4 years ago at 2 different shows, didn't buy either, I wanted a .22LR, wish I had bought the .17. I don't remember about the grip arrangement on either. I have seen 'cataloging' references to both types. Took me several years to chase down a 516 Striker in .223Rem, center grip, laminate. I like it. I also have a center grip Xp100 and a rear grip XP100R, like them as well.