Gaging Army Maintenance

1 Gage bolt carrier assembly for firing pin protrusion using firing pin protrusion gage PN 7799735. See page 3-20, TEST.

2. Gage bolt carrier assembly for firing pin hole wear using not-go plug gage PN 12620101. See page 3-24, TEST.

3 Inspect chamber in upper receiver and barrel assembly using chamber reflector tool PN 8448201 See page 3-33, INSPECTION/CLEANING.

4 Gage barrel in upper receiver and barrel assembly using barrel erosion gage PN 8448496 and bore straightness gage PN 8448202. See page 3-45, TEST.

5 Check headspace in upper receiver and barrel assembly by inserting headspace gage PN 7799734 in chamber. See page 3-45, TEST.

6 Gage pivot pin lug area clearance in lower receiver assembly using 0.020 thickness gage. See page 3-68.

7 Gage hammer and trigger pin holes in lower receiver assembly using taper plug gage PN 12006472. See page 3-68, TEST.

8 Gage trigger pull using trigger pull measuring fixture PN 7274758. See page 3-83, TEST.

9 Document inspection with DA PAM 738-750, AFTO Form 105, or NAVMC 11003 when completed.

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