You asked, Noveske listened. New slim design allows installation under the Noveske NSR handguard in addition to many other popular slim diameter rails. The Noveske KX5 Flash Hider is designed to increase reliability in short barreled AR-15 pistols by increasing back pressure. Also, the KX5 directs the muzzle blast forward which alleviates most of the discomfort when firing the AR-15 with an abbreviated barrel. Although originally designed for short barreled AR-15's the Noveske KX5 will work on any barrel length. All KX5s are individually serial numbered for quality control and come with a crush washer for timing purposes.FeaturesSlim design for use with small diameter handguardsDirects muzzle blast forwardIncreases back pressure when used with shorter barrels