The Presma 15" Super Light free-float handguard is a lightweight M-LOK rail for AR-15 / 5.56 rifles. CNC-machined from 6061 aluminum and finished in a matte black hardcoat anodize, the complete assembly weighs just 11.9 oz with the barrel nut - a real weight savings over quad-rail and heavier free-float designs, without giving up mounting real estate. Specs and features: 15" free-float M-LOK handguard for AR-15 11.9 oz total weight (handguard + barrel nut) Full-length Picatinny top rail (partial top rail spec - top-mounted optics welcome) M-LOK slots on the sides and bottom for accessories, lights, and QD sockets 6061 aluminum, black anodized 1.6" wide, 2.0" tall, 1.358" inner diameter Includes handguard, steel barrel nut, and timing shims Made in USA Compatibility: AR-15 upper receivers with a standard barrel-nut interface. Compatible with low-profile gas blocks (clears the 1.358" ID). Not compatible with A2 front sight bases or FSPs - those require the block/sight to sit outside the handguard. Verify your gas block outer diameter and barrel journal clear the ID before installation.