Firefields Fringe 12-inch M-LOK rail features a slim skeletonized carbon fiber body with an aggressive design robust enough to handle all M-LOK attachments. The Fringe rail features a numbered rail slots to help with re-zeroing lasers and sights. A QD sling socket allows you to quickly attach a sling to your AR. This diverse rail will accept Picatinny, NATO, and Weaver-sized attachments.