Never cock the gun with the backplate off.
(b) Hold the bolt in this position and screw the barrel fully into the barrel extension; then unscrew the barrel two clicks or notches.
(b) Use a nickel and a dime or four dog tags as a no-fire gauge.
(c) Set the timing using the normal procedure.
(3) To check for correct settings:
(a) Attempt to fire the weapon. If it fires sluggishly, clear the weapon then unscrew the barrel one more notch.
(b) Recheck the rate of fire. Repeat the procedures in paragraph (1); however, do not exceed two more clicks.
(c) Do not unscrew the barrel more than one notch between test firings.
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