The whole marketing point with the new X5 series is they are modular and you can change out accessories like different rear sights, optics mounts, slide rackers, weights etc. I have found no X5 accessories available in the states for past models or the new models. I emailed the Gunbroker dealer importing so many and they could not get me an accessory. I guess we are stuck with a Dawson Precision front sight as the only mod. I wanted a X-Mount for my X5 Competition. If you spend the bucks on their Open model it comes with one but you are supposed to be able to buy a base model and build it up from there.