The RB5000L can be paired with any style buffer spring, however in most cases, the buffer pairs best with reduced powered springs.    This buffer is intended to be used with AR-15’s that wont lock back on the last round with our standard AR-15 buffer system or a heavy buffer. The RB5000L’s unique design is made lighter and requires less force to cycle than our standard AR-15 buffer system, which is perfect for low velocity ammunition like the .300BLK. Please note, .300 BLK applications exclusively running supersonic ammo can use our standard AR-15 buffer system if the bolt cycles firmly and has proper ejection placement.    Our buffers patented technology absorbs the recoil impulse from the bolt carrier’s rearward motion, preventing bolt bounce as a new round is chambered. The RB5000L reduces felt recoil by 30%, improving the shooters overall accuracy and eliminating muzzle flip. Our test data shows that the time to reacquire a target decreases, and in most cases the shooter will not have to leave their scope after taking their shot.