 The Six Arc was developed to provide increased performance in the M4 AR-15 platform. The Six Arc pushes a 90 grain dual performance at 2,650 feet per second with over 1,400 foot pounds of energy. The monolithic solid copper bullets design allows pedals to separate after impact, spreading to create wound tracks and significantly adding to terminal performance. This round is an exceptional option for your modern sporting rifle. Black Hills Ammunition, the power of performance.