The KynSHOT RB5004 Recoil Buffer is a hydraulic buffer system designed and optimized to fit any AR-10 using a Mil-Spec style carbine buffer tube (internal depth 7"). The RB5004 can be paired with any style AR-10 buffer spring. The buffers absorb the recoil impulse from the bolt carriers rearward motion, preventing bolt bounce as a new round is chambered. The RB5004 reduces felt recoil by 30%, improving the shooters overall accuracy and eliminating muzzle flip.