The Knight’s Armament SR-15 is a premium 5.56mm NATO AR-pattern rifle built around KAC’s battle-proven operating improvements, ambidextrous lower receiver, cold-hammer-forged chrome-lined barrel & free-floated handguard system. Current SR-15 KS-series models include multiple barrel lengths, while the classic 16" SR-15 Mod 2 remains the reference point for shooters who want a cleaner, smoother, more refined AR. The SR-15’s reputation is built on serious reliability, excellent parts life & KAC’s obsessive engineering, especially the E3-style bolt system, improved gas system & fully ambidextrous controls. It is expensive, frequently unavailable & annoyingly hard to criticize once you shoot one, delivering duty-grade performance, low recoil impulse & high-end build quality for professionals, collectors & enthusiasts.