The REPR hands down! Many standard parts. Try finding mags for the SCAR. The REPR has the advantage of mags, any SR-25 style mag. P-mags, C-products, Larue, KAC....... If you are familiar with the AR platform, it's a no brainer. I have the 18", and while it doesn't stack bullets on top of each other like my 260 Bolt gun, it does go bang everytime, clean, dirty, suppressed, un-suppressed, frozen, you get the idea. I hit 5 out of 5, a 12" steel plate at 775 yards. I have shot plenty of scar heavys, and while they all went bang, I can't say much for the way they handle. Not for me. In the end, get what you want, and shoot the damn thing. J