The rail is well made, 385$ is alot to pay for something like this though. I imagine this would work similar to the Sig mcx sd rail, but that is not the case. I think B&T should put, “For SD Guns only”. I have an APC9K and bought this rail to cover my suppressor, i thought it would slide over the stock rail, only to find out it is not compatible with normal APC9ks. I reached out to B&T, got no response. This sight doesn’t offer refunds, so im left with a 400$ paper weight.