I used some plexi I found, which appears to be about 2mm thick.
Cut a strip approx. 18mm wide and a strip 11mm wide.

Glue the smaller strip centered on the larger.

Mark a channel in the center of the larger rail.

Dremel that space out. Also Dremel a divot where the notch on the N-Strike attachment will rest.

Attach the completed rail to your blaster using glue or screws or whatever.

Nifty!
