The Troy A4 scales the A3 design to the AR-10 platform in .308 Winchester. It uses a 16-inch barrel, full-length free-float rail, and Troy's enhanced furniture. The A4 targets the mid-range .308 semi-auto market with Troy's reputation for rail accessories. Type: Semi-Auto Rifle Action: Direct Impingement Caliber: .308 Win Capacity: 20 Year introduced: 2012, USA Weight: 8.9 oz Overall length: 35" Status: Active Intended use: Range, Hunting, Home Defense