Pistol grip version of the M4 H2O, combining the marine-grade nickel finish with a vertical pistol grip stock for maximum corrosion resistance in a CQB-optimized configuration. Type: Shotgun Action: Semi-Automatic Caliber: 12 Gauge Capacity: 5 Year introduced: 2010, Italy Weight: 92 oz Overall length: 40" Status: Active Military use: Yes Intended use: Military, Tactical, Law Enforcement