The M40A3 updated the USMC sniper system with a new McMillan A4 stock with adjustable cheekpiece and length of pull, improved barrel, and compatibility with modern optics. Served Marines in OIF and OEF. Type: Bolt-Action Rifle Action: Bolt-Action Caliber: 308 Win Capacity: 5 Year introduced: 2001, USA Weight: 16.5 oz Overall length: 44" Status: Active Military use: Yes Intended use: Military, Precision, Sniper