More specific features of the bond arms lvrb include:- a rotating bolt for strength and precision.- chambering of modern cartidges.- user configurability and modification.- utilization of modern materials.The result is compatibility with the ar-15 platform in components critical to changings calibers, including barrels, bolts, and magazines.While there is also compatibility with ar-15 upper receivers and handguards, there is an additional opportunity to optimize these components for this application by eliminating the gas system and moving sighting systems almost a 1/2in closer to the bore.Action: LeverCaliber: 223 WyldeBarrel Length: 16"Capacity: 30+1Oal: 39.50"Weight: 6.40 lbsStock Description: Magpul SGABarrel Length Range: 16" to 16.99"Weight Range: 6 lbs to 6.99 lbsStock Finish Group: Black