Here's an alternative stock idea. Especially if you are going to use the XCR for a pistol or SBR setup, it might be a good idea to get leemajors' XCR 1913 adapter, then pair the stock with the ACR to 1913 adapter from Haga Defense. That way the 1913 rail on the XCR can act as a pistol cap for times when you want to go stockless, then you can quickly attach the ACR stock when you need it. With the 1913 rail on the stock, you can also use it on other guns that you have with a 1913 rail such as the Sig MCX/MPX, CZ Scorpion, et al. It'll cost more initially and you'll be connecting adapters to adapters, but I suspect the Haga Defense adapter will fit more easily onto the stock and you'll save money on stocks by swapping the ACR stock around with your other guns (provided you are willing to put in the work and order 1913 adapters for all of your other guns). Might try to replace the socket head cap screws on the ACR stock 1913 rail with long thumb screws if you want to switch it around without carrying an allen or hex wrench. I considered doing this myself but with my rifle being a 16" competition length, it didn't make that much sense in my case.