The benefits of bolt buffers are well documented. The TEN22 ShockStop Buffer is designed to do more than just make your 10/22 function more efficiently. By producing this highly advanced polyurethane at just the right durometer (hardness), the end result is a buffer that will protect your receiver and optics by absorbing and dispersing the damaging shock associated with metal to metal contact during firing. Backed by an unlimited lifetime warranty against breakage, the ShockStop buffer is the last buffer you will ever need. ShockStop Buffers....Clearly Better!