Consumer-labeled CR6920 — same specification as SP6920. 16.1" M4-profile barrel, 1:7 twist, A3 flat-top upper. Type: Rifle Action: Semi-Automatic Caliber: 5.56 NATO Capacity: 30 Year introduced: 2010, USA Weight: 6.36 oz Overall length: 32.5" Status: Active Intended use: home_defense, hunting