This Krebs Custom UFM M-LOK Handguard system gives you unlimited possibilities for mounting slings and accessories. Designed to be light in weight, the 6061 T6 aluminum construction and "M-LOK" mounting system allow for quick installation of rail sections wherever the shooter desires, while adding only 0.8 ounces to the total weight of your rifle. The ultra-sturdy design allows for solid optic mounting on the 1913-style top rail.Note: This fore-end is designed ONLY for YUGO-Pattern (M70 and M90) rifles.