Anyone try this combo? Does the rail lock position allow you to use the P spacer or does it use the U press-fitted between the picatinny slot and front of the trigger guard like the 300U? Thanks

So for anyone wondering the same question I looked at photos online and it seems the position of rail slots are the same.

FORTUNATELY I discovered that the Surefire X300s have a removable spacer in the back that allows the light to mount on the VP9 with the Picatinny mount. So you can mount the light on the VP9 with the U mount OR with the P mount if you remove the plastic spacer (punch out 2 sets of pins). Pretty sweet

I wanted the P mount on the light for logistical compatibility purposes between guns.

FYI for all