If inspecting non-ribbed type barrel assembly, perform steps 1 and 2 only. If inspecting ribbed type barrel assembly without locking tab washer, perform steps 1 through 4. If inspecting ribbed type barrel assembly with locking tab washer, perform steps 1 through 5.
1. INSPECT BARREL.
a. Visually inspect threads (1) for signs of cross threading. Replace 25-mm barrel (2) if threads (1) have been damaged by cross threading.
b. Visually inspect exterior of barrel (2) for corrosion. If corrosion is found, remove corrosion with abrasive cloth and apply solid film lubricant.
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