Firing pin should touch the gage on minimum but should not touch on maximum

3. Replace a defective firing pin.

e. REPAIR

Replace all authorized unserviceable items. Retest all replaced parts.

f. REASSEMBLY

1. Install bolt assembly (1) into key and bolt carrier assembly (2).

2 Install bolt cam pin (3) and rotate one quarter turn to secure bolt assembly (1)

3. Hold key and bolt carrier assembly (2) with bolt assembly (1) down and drop In firing( pin (4)

4. Install firing pin retaining pin (5) from left side only to ensure proper Installation Check Installation by attempting to shake out firing pin

5. Reassemble rifle, refer to page 3-77

What Gage And Pitch Bolts M16 Gage
3-8. BOLT ASSEMBLY.

This task covers:

a. Disassembly

c. Test

b. Inspection/Repair

d. Reassembly

INITIAL SETUP

Test Equipment

Materials/Parts

Tool and Gage Set (Item 2, app B)

Penetrant kit (item 25, app D)

Rag, wiping (item 26, app D)

Tools

(ARMY) Small Arms Repairman Tool Kit

Equipment Conditions

(Item 3, app B)

3-16 Bolt assembly removed

a. DISASSEMBLY

a. DISASSEMBLY

NOTE

Do not remove bolt rings unless they require replacement and three new replacement bolt rings are on hand.

Using small flat tip jeweler's screwdriver, remove the three bolt rings (1) from the bolt (2).

b. INSPECTION/REPAIR

1. Visually Inspect bolt rings for cracks, kinks, and bends. Replace all three bolt rings if one or more bolt rings is damaged. See page 3-16 for bolt ring wear check.

3-8. BOLT ASSEMBLY (CONT.).

b. INSPECTION/REPAIR (CONT.)

2. Inspect bolt for pits, burrs, and wear as follows.

(a) Bolt faces with a cluster of pits which are touching or tightly grouped, covering an area measuring approximately 1,8 Inch across, will be rejected and replaced.

(b) Bolts which contain individual pits or a scattered pattern will not be cause for rejection.

(c) Bolts that contain pits extending Into the firing pin hole will not be rejected unless firing pin hole gaging check determines excess wear.

(d) Rings on the bolt face (machine tool marks), grooves, or ridges less than approximately 0.010 inch will not be cause for rejection.

unserviceable serviceable unserviceable serviceable

3-22

3. Inspect bolt for cracks In the locking lugs and the bolt cam pin hole area. Use black light If available; otherwise, use a glass of no more than 3X magnification or use a penetrant kit (item 25, app D). Pay close attention to the area where the locking lugs meet the body. Replace bolt assembly if bolt is defective.

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