Was thinking about getting away from the bulky forend light and testing an X300.
If so what rail did you use and has it held up alright?
I used a piece of Leupold steel Weaver rail from a Remington 700 set. It allows the light to sit lower against the forend than a Picatinny rail will. I threaded the polymer and milled out a space on the backside for backing nuts. After locking it down, I ground the screws flush with the nuts and staked them for extra security. This setup has been on my 590A1 since about 1998 with no issues.
Nice, good idea.
I picked up a small Nordic Components rail that clamps on the barrel and mag tube, I dont like the light going back and forth every time I cycle the action.
http://www.midwayusa.com/product/667570/nordic-components-magazine-extension-tube-barrel-clamp-with-picatinny-rail-12-gauge-aluminum-matte