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That is, the cffect of the initial compression causes the gun recoil velocity to decrease at the rate of 127 feet per sccond. This loss is shown in fig. 3-32 by the curve designated as step 2 for the gun.

When the piston strikes the bolt, the bolt velocity will be increased from 25.8 feet per second to 55 feet per second. This action will occur practically instantaneously as shown in fig. 3 32 by the vertical line at 0.005 second. After the impact occurs, the

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