The genesis of modular free float rails has arrived. Building off of the TRX Extreme design that revolutionized rail based Handguards; the Alpha Rail utilizes a new low-profile locking mechanism, which offers unparalleled strength and stability. With built-in legendary Troy spring loaded front Battle sight, unlimited mounting options and greater heat dispersion the Alpha Rail once again sets a new industry standard in modular free float rail design.- 15"- Comes with three small detachable rails and all mounting hardware- Built-in spring loaded front folding M4 style Battle sight- Machined from 6061-T6 hardened aircraft aluminum and finished in MIL-SPEC Type III Hard Coat Anodizing- Works with standard AR15/M16 barrel nut- Made in the U.S.A.- Black.