![]() ![]() 9) over the splined portion of the barrel. To make a check, use a barrel and receiver that has been assembled in the fixture and slip the barrel alining gage with pin (fig. 13) monthly or oftener if necessary to see that barrels are being alined properly. Check the barrel and receiver assembly fixture (fig. (3) Checking barrel and receiver assembly fixture. 23), the operating rod assembly should be disposed of as unserviceable and uneconomically reparable, since an undersized gas piston tends to reduce the power available to operate the weapon. ![]() If the piston diameter is below the minimum specified by the serviceability chart (fig. Pending the correction of these gages, the piston diameter will be measured with a micrometer and pistons which measure 0.525 inches or more should be considered unserviceable. 35) All no-go piston diameter gages, initially produced are being withdrawn from service for reworking since the dimension of these gages has proven unsatisfactory. Inspect the diameter of the piston using no-go piston gage. Inspect the piston for scoring and the accumulation of excessive carbon. If there is binding, inspect the tube for dents and the handle for deformation, which will cause binding of the under side of the lug on the cut in the receiver. As the rifle is tipped up and down, the rod and bolt should be moved from closed to open position and back by their own weight. Inspect for binding between the barrel and receiver group and the operating rod by installing the rod and bolt in the rifle. ![]()
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