In order to bring the barrel to a stop, this kinetic energy must be absorbed by a buffer. If it is assumed that the motion of the barrel is stopped within one-half inch after engaging the buffer, the average force exerted on the buffer must be:

This serves to indicate that the barrel buffer must be constructed very ruggedly. Buffers for applications of this sort arc usually constructed intentionally so that there will be a considerable energy loss during the buffing action. This is done in order to damp out undesired motion of the barrel. In a well-designed buffer, the energy loss can be as high as 70 percent; that is, the kinetic energy* of the barrel after its motion is reversed will be only 30 per cent of the energy it contained upon first striking the buffer.

The motion of the barrel during the time of action of the buffer will depend largely on the particular characteristics of the buffer used. It should be noted that while the buffer is acting, the effect of the barrel spring is so small by comparison that

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