Rich trooper: You biggest concern in this, is modifying the butt plate, to give it the right shape. JR supplie it in a weird shape, that will never get you approved, so you need to cut it and make it look right(Look at the side pictures in the first post. The rest, is more or less(Probably more) adjusting the parts to your size. The CRL have changed since I got my JR basic approved, so cant remember if you need to change the back plate entirely, to get a smaller OII detail. But good luck, and if you have any questions, feel free to contact me, and I will help you as good as I can