I have the XCR compact tac. in 223. (20" BBL) The extra coin is for the B&C stock (rather positive its not a HS). Hogue stocks get a lot of flex if you put pressure down on the fore end. Second, you are paying for an all stainless barrel and action that is PVD coated. In all honesty, Remington's PVD coating is awesome. My rifle gets used pretty hard and it has not one scratch on the barreled action where I can see metal thru, its really tough. The SPS is not stainless and has a rougher finish, bead blast/blued? Basically a cheaper version of a parkerized barreled action as found on the 700P. The XCR has the 40X trigger, same as their custom shop rifles have. Its adjustable and breaks like glass. The SPS I believe has the x-mark trigger. Umm, the XCR has the fluting on it if that matters to you. Accuracy wise, with 69gr. FGMM, my XCR will hold under MOA out to 400 yards. Usually at 500 it hovers under/over MOA. I've never shot an SPS, but i know they can be shooters as well. In my opinion, their biggest downfall would be the the stock and trigger, in that order. Those are the differences, you'll have to decide if they are worth the extra $400 or so . Hope this helps.