Features of the Mossberg 500 Rolling Thunder include the venerable 500 pump-action 12-gauge shotgun, which serves as the basic platform for more sporting, home defense, tactical and military shotguns. This model features a 23-inch cylinder-bore barrel with a three-inch chamber and brass bead front sight. Additional features are a barrel heat-sheild and a solid aluminum, ported muzzle stabilizer, which reduces recoil and mThe Mossberg 500 Rolling Thunder line includes the 500 pump-action 12-gauge shotgun, which serves as the basic platform for more sporting, home defense, tactical and military shotguns. The model features a 23-inch cylinder-bore barrel with a 3-inch chamber and brass bead front sight. Also includes a barrel heat-shield and a solid aluminum, ported muzzle stabilizer, to reduce recoil and muzzle jump but drilled and tapped to accept the Mossberg Picatinny rail system. The Rolling Thunder’s short, overall length and light (6 3/4 pounds) weight combine to make for easy handling and fast swinging needed for defense situations in tight places.uzzle jump but drilled and tapped to accept the Mossber picatinny rail system. The Rolling Thunder's short overall length and light, 6 3/4 pounds, weight combine to make for easy handling and fast swinging needed for defense situations in tight places.