Specifications

TM 05539-IN
PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS)
INCLUDING LUBRICATION INSTRUCTIONS - CONTINUED 0008 00
0008 00-5
INTERMEDIATE PREVENTIVE MAINTENANCE CHECKS AND SERVICES - CONTINUED
Table 1. Intermediate Preventive Maintenance Checks and Services (PMCS) Quarterly Schedule - Continued.
ITEM INSPECTED PROCEDURE/CONDITIONS
Barrel and Receiver Assembly
1. Inspect the barrel for bulges, burrs, obstructions, or pits in the chamber or bore. Refer
to WP 0016 00.
2. Inspect the muzzle end of the barrel for a serviceable crown; the lands and grooves
should have no nicks or burrs. If any of the above problems exist, evacuate to higher
level of maintenance for repairs.
3. (M40A5 only) Inspect the muzzle break for looseness, cracks, and/or damage.
Replace muzzle break as necessary and re-zero weapon with and without suppressor.
4. Ensure the stock’s bedding surfaces are clean and oil free. Place the stock topside
up in a padded vise.
5. Carefully insert the recoil lug of the barrel and receiver assembly straight into the
lug mortise inside the stock.
6. Assemble trigger guard and place on stock.
NOTE
When installing the trigger guard screws, ensure that the short screw
goes into the hole in the front portion of the trigger guard. The long
screw goes into the rear hole next to the trigger guard bow.
7. Install forward trigger guard screw first, then the rear screw. Tighten both screws
by hand.
8. Review the Weapon Record Book for the latest torque setting. Both trigger guard
screws are torqued at the same setting.
9. Using an -in.-lbs. torque wrench, set proper torque for the weapon in accordance
with the Weapon Record Book and then torque the trigger guard screws; front screw
first, then the rear screw. Do not over-torque or under-torque these screws, as the
weapon’s accuracy will be affected.
Bolt Assembly
Bolt 1. Inspect the face of the bolt and bolt lugs for cracks, chips, or pitting. Evacuate to
higher level of maintenance for repairs.
2. Check headspace. Refer to WP 0023 00.
Extractor 1. Ensure extractor is securely in place and functioning properly inside the bolt face.
2. The extractor should have spring tension and return to position after being depressed.
Extractor should not be chipped, worn, or fouled with brass chips. If any problems
exist, evacuate to higher level of maintenance for repairs.
Ejector 1. Check ejector for proper spring tension.
2. Depress the ejector; it should depress slightly below bolt face and fully return when
released. If any problems exist, evacuate to higher level of maintenance for repairs.