The surefire beam filters that fit the E series work on the KL4 bezel for sure. Also-the countycomm.com (Sponsor) tactical nylon $5.00 sheath is a winner. It has a large flap and the sides expand to hold lots and lots of different lights. It will fit any 2 cell SF and the Reactors, the XT5's, even a PM6. Best deal going on belt sheaths. Also-it can be rigged for a horizontal carry; which is nice when seated and for driving.