I only plan on mounting an X-200, so I don't need the tri-rail mount.
The magazine cap mount doesn't look like it would slide off, but it looks fragile. If it got bent inwards, wouldn't it block the fore end?
The magazine tube mount seems like it would be the exact opposite.
Please tell me more about each mount.
ETA: The X-200 comes with a rail adapter of some sort. What does it do? Will it allow the X-200 the ability to mount on a USP?