The KynSHOT RB5000 Recoil Buffer is a hydraulic buffer system designed and optimized to fit any AR-15 using a Mil-Spec style carbine buffer tube (internal depth 7"). The RB5000 can be paired with any style buffer spring, and is a simple drop-in replacement for all buffer systems on the market.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 RB5000 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.The KynShot recoil damper helps to reduce felt recoil up to 30%, allowing for faster and more accurate follow up shots. Tested and vetted by law enforcement, competitive shooters, and military alike! The high-strength 17-4 stainless steel construction is virtually impervious to corrosion. Combined with their military grade materials and manufacturing processes, and KynShot offers a conditional warranty for 10 years or 1 million rounds! For subsonic ammunition such as .300BLK, especially when running unsuppressed, the RB5000L is recommended for proper function.