The Seekins Precision SP223 is the original Seekins 5.56mm billet AR-15, featuring Seekins' in-house machined receiver set and proprietary NSR handguard in a duty-weight configuration that established the brand. Type: Rifle Action: Semi-Automatic Caliber: 5.56x45mm NATO Capacity: 30 Year introduced: 2011, USA Weight: 66 oz Overall length: 34.5" Status: Active Intended use: Tactical, Precision