THORNTAIL KeyMod M3M61913 Offset Adaptive Light Mount is designed to accept Surefire M300/M600 Scout, Streamlight Rail Mount 1/2 & HL-X Weaponlights and Backbone Replacement M300/M600 Scout Bodies and other Replacement M300/M600 Scout Bodies and any 1913 rail mounted weapon lights (INFORCE APL, WML's, Surefire X300's, X400's, Streamlight TLR's) to a KEYMOD Compatible Forend, eliminating the need for separate bulky 1913 rail sections and a separate light mount..