Troy Alpha Rail Free Float Modular AR Handguard No Sight 13in Black NSN - 1005-01-621-9175. Troy Industries designed these AR Handguards & Forends based on the TRX Extreme design and incorporated a low-profile locking mechanism. Troy 13-inch Alpha Handguards are surprisingly light fit solidly and add an aggressive look. With its versatile mounting options and greater heat dispersion the Troy 13-inch Alpha Rail Hand Guard will make a great addition to your AR. Note: Alpha rails do not work with the TRX Barrel Nut or TRX Barrel Wrench. Specifications for Troy Alpha Rail Free Float Modular AR Handguard: Manufacturer: Troy Color: Black Fabric/Material: Aluminum Gun Make: AR Platform Gun Model: AR-15 Gun Type: Rifle Handguard Length: 13 in Handguard Type: Free-Float Gun Rail: Picatinny Weight: 9.92 oz Condition: New Included Accessories: Standard Quantity: 1 Features of Troy Alpha 13-inch Free Float Handguard Rail STRX-AL1: Genesis of modular free float rails. Built off the revolutionary TRX Extreme design. Utilizes low-profile locking mechanism offering unparalleled strength and stability. Disperses heat and runs cooler than other close-to-the-barrel rails. Comes with two 2-inch and one 4.2-inch detachable rails and all mounting hardware. Machined from 6061-T6 hardened aircraft aluminum and finished in MIL-SPEC Type III Hard Coat Anodizing. Stainless steel components. Works with standard AR15/M16 barrel nut. (Not included.) Easy install solid fit distinctive look. Limited Lifetime Warranty. Package Contents: Troy Alpha 13-inch 1-Piece Quad Rail STRX-AL1-13 Rails Mounting hardware Troy STRX-AL1-13BT-01: Alpha Rail AR-15 Free Float Modular Handguard No Sight 13in Black NSN - 1005-01-621-9175