Faxon Streamline G4 M-LOK Handguards are a sleek and low-profile solution for those looking for a slimmer handguard with flexible mounting. The Gen 4 Aluminum Handguards feature M-LOK mounting slots at the 3, 6, and 9 o'clock positions. Further, the G4 features an uninterrupted MIL-STD 1913 "Picatinny" rail across the entire length of the handguard. Rail slots are directly engraved with "T" marks during machining to identify accessory placement. The handguards feature a removable anti-rotation tab that gives the customer the flexibility of using either a Billet or Mil-Spec upper receiver. The handguard is 100% made from extruded 6061 aluminum. The handguards are hard-coat anodized black and feature a steel barrel nut. Mounting is extremely simple with common tools and the handguard features alignment tabs to ensure it cannot rotate during vigorous movement. Features Height (Flat to Flat): 1.54" Max Outer Diameter (Peak to Peak): 1.67" Max Inner Diameter: 1.34" Construction: 6061 Aluminum - Hard Coat Anodized Accessory Mounting: M-LOK