The KynSHOT RB5000L Recoil Buffer is a hydraulic buffer system designed and optimized for softer cycling, under gassed AR-15's using a Mil-Spec style carbine buffer tube (7" internal depth). The RB5000L can be paired with any style buffer spring. 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 is made lighter and requires less force to cycle than the standard AR-15 buffer system, which is perfect for low velocity ammunition like the .300BLK. The buffer absorbs the recoil impulse from the bolt carriers 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.