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c. Scattered or uniformly fine pits in both Chamber (9) and Bore (8) are allowable.

c. Scattered or uniformly fine pits in both Chamber (9) and Bore (8) are allowable.

Erosion Gauge Barrel Gun

5. Inspect Bore (8) for erosion using the following procedures:

a. Gently, but firmly insert the Breech Bore Erosion Gage (11) as far as it will go.

b. There are two gage lines on the Breech Bore Erosion Gage (11). The line farthest from the front of the gage is the "REJECT" line. Read the gage by looking across the end of the Barrel Breech (12). If the "REJECT" line on the gage enters the Barrel Breech (12), the barrel is unserviceable and must be replaced.

Must M16 Barrel Change

3-10. MAINTENANCE OF BARREL ASSEMBLY (Cont)

INSPECTION/CLEANING/REPAIR (Cont)

6. Inspect both Barrels (5) (weapon and spare) for proper headspace using the following procedures:

NOTE

Use Bolt Assembly that accompanied the weapon/barrel assembly.

Prior to headspacing, lock bolt in the barrel to get a feel for the natural friction and identify where the cam lug is located when the bolt is locked.

a. Insert tapered end of Headspace Gage (12) into Barrel (5).

b. Insert Bolt (13) into Barrel (5) and (with slight pressure) attempt to lock Bolt (13) (by rotating to the left) with Headspace Gage (12) installed.

CAUTION

Forcing the bolt closed will harm the gage and give you an incorrect reading.

c. Barrel (5) and Bolt (13) are considered to have proper headspace if Bolt (5) DOES NOT lock into Barrel (5) with Headspace Gage (12) installed. If the bolt seems to lock, but more resistance is felt than without the gage in place, headspace is correct.

NOTE

Barrel (5) and/or Bolt (13) may be defective if Bolt (13) locks into Barrel (5) with Headspace Gage (12) installed.

Gage Breechbore M60

d. If Bolt (13) locks into Barrel (5) with no resistance, headspace is faulty and the defective component must be determined.

e. To determine the defective component, follow steps 1 and 2 below:

(1) Repeat headspacing using OLD Bolt (13) and NEW Barrel (5). If headspace is still incorrect (bolt locks into barrel) Bolt (13) is unserviceable and should be replaced. If headspace is now correct, repeat headspacing (see step 2 below).

M16 Exploded View

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  • terttu
    Which line on m16 barrel erosion gage?
    7 years ago

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