Semi-automatic operates on Inertia Driven system, which is designed to operate with 2.75", 3" and 3.5" 12-gauge shells. Barrel lengths are 26", 28" or 30" and weight of all three length models is between 6.7 and 6.9 lbs. Synthetic stock makes it ideal for all weather conditions. Several Realtree and Mossy Oak camo designs are available. NOTE: Add $100 for camo models if in good or better condition.