This 11.2 inch Z rail allows shooter to mount optics / holo sight above and mount light or laser in the forward position- preserving forend space and keeping a slimmer profile than forend mounting options.  See-through design allows shooter to view iron sights through the rail.  Made of tough matte black alloyed aluminum weighing in at 8.3 ounces. Excellent value - used by many agencies. Add $7 if shipping US mail.