The Troy Industries folding front BattleSights feature push-button operation and tool-less adjustment. Constructed of aircraft aluminum with stainless hardware. BattleSights feature a zero cant mounting system ensuring perfect sight alignment. Sight mounts to the receiver with a cross bolt. Handguard height are for mounting on a rail system, will not work with railed gas blocks. Gas Block height are for use with railed gas blocks. Includes tritium front sight post.