This is the Nordic Components 9.25" Picatinny Top Rail Section fits their Mid length NC-1 handguard" providing a full length top rail. It is also compatible with most handguards with a 2" outside diameter and 1.75" hole spacing. It is the correct height for mounting sights on an AR-15 platform.

Features:
Nordic Components Picatinny Toprail for NC1 Mid-length Handguard
9.25" Full-length
Includes all attachment screws