The X-7 itself has a huge number of existing mods for the fore grip and the stock. I have already moded mine with an XP-5 fore grip and a CAR stock. The front magazine is very cool as it holds two allen wrenches and leaves room for more storage, this is really handy in the field as the tools are only ever a few inches away. The e-grip's added firing modes are particularly handy. Unlike the A-5, the X-7 has a lack on the side, one for safety, one for single fire, and one for special fire. This is a handy upgrade from the A-5, as if you go to a field that only allows single fire, you are only a flip away from standard fire. The battery on the X-7 is also located in the back of the handle, so its much easier to get out then the A-5. Although the handle feels odd with no battery in there, as the marker will not fire without it, its not too much of a problem. 5 stars