3-10. MAINTENANCE OF BARREL ASSEMBLY (Cont).
f. Repeat headspacing using NEW Bolt (13) and OLD Barrel (5). If headspace is still incorrect (bolt locks into barrel) Barrel (5) is unserviceable and should be replaced.
Both barrels and bolt, assigned to the weapon, must pass head-spacing check. If the bolt is replaced, ensure that both barrels pass the headspace check.
If at any time a NEW barrel and NEW bolt does not headspace, take action to have headspace gage calibrated.
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