Riser,Asm,CTS-1400,Absolute,w/screw. Now you can mount your CT RAD(TM) MAX in a co-witness configuration. With the CT RAD(TM) MAX full co witness mount, end-users can mount their CT RAD(TM) MAX on any firearm with a Picatinny rail section and co-witness with their iron sights. Mount attaches to a MIL-SPEC Pic Rail. CT RAD(TM) MAX footprint. Works with CT RAD(TM) MAX and CT RAD(TM) MAX Pro. Full co-witness profile for use with backup sights. Aerospace aluminum construction. Mfg: Crimson Trace Corporation