I have a Super X-1 field model and they are a nice gun. At $ 450.00 it's a good buy, but I'll second the advice to check the recoil buffer. Simple to do by just dropping out the trigger group and inspecting. If the buffer is shot out it will bang up the rear of the receiver and can break the breach block as well and thats a expensive fix. Suggest you put in the tune up kit from Brownells which will run you around $75.00 ( buffer, recoil spring, plunger , gas seal and believe it includes a stainless replacement tube ).
REM3200