Shotgun Mag Tube Clamp with Light Rail Machine aluminum with 3 sling M1913 rail for attaching weapons light or camera 6061t6 alum Mil spec type 3 hard anodised finish We can confirm that it will fit the following as well as many others Browning BPS police Rem 879,1100,1187 Benelli m1,m2,sbe Moss 500 7 shot Win 1200,1300 7 shot Norinco/hawn hp9 Pardner 18inch