Each of our Modern Carbine™ enhanced buffers are precision machined and are designed for both AR-15 and AR-10 platforms. It is designed to reduce recoil by softening and dampening the felt recoil impulse. Our buffers are also tuned for optimal speed with traditional or suppressed shooting. included with our enhanced H3 buffer is our finely tuned enhanced buffer spring. The spring is made from 17-7 Stainless. For quiet operation and increased longevity, the spring has been black oxide coated and dry moly lubed. These kits come standard on all MC6 rifles.