While they very much falls in towards the category of obsolescence now, the RIS and RAS are definitely the handguards that started the continuous evolution which has produced the AR-15 forends We have now currently available, which by themselves are arguably one of the most critical factors in ergonomic use https://kacm4ras52962.onesmablog.com/the-2-minute-rule-for-knights-armament-rail-66863988