Shop › PHASE5 LPSN15 MLOK FF QUAD RAIL 15" PHASE5 LPSN15 MLOK FF QUAD RAIL 15" $150.00 Phase 5 Weapon Systems Lo-Pro Slope Nose Free Float M-LOK Rail, 15", Black Finish, Steel barrel nut and mounting hardware included, Built-in QD Mounts with Internal Stops LPSN15MLOK Quantity: Add To Cart Added! Phase 5 Weapon Systems Lo-Pro Slope Nose Free Float M-LOK Rail, 15", Black Finish, Steel barrel nut and mounting hardware included, Built-in QD Mounts with Internal Stops LPSN15MLOK