7. Visually inspect the face of the breech insert (1) for damage. Inspect the breech insert; it should not protrude above the breech face and should not be more than 0.007 inches (0.018 cm) below the breech face. If the weapon fails any part of the above inspection, skip to step 9 for repair. If the weapon passes all of the above inspections, skip to page 3-27 for reassembly.
There is no reverse torque requirement on receiver assemblies with serial numbers 39700 and above.
Before inspecting an M203 with serial number 39700 and below, check records to see if it has previously had its breech insert repaired. If it has been repaired, inspect in accordance with step 7 above.
8. Use torque wrench adapter and torque wrench and apply 60 in.-lb (6.78 N-m) of reverse torque to the breech insert (1). If insert indicates no movement and meets the acceptable criteria cited in step 7 above, it is acceptable; skip to page 3-28 for reassembly. If it does not meet this criteria, continue with repair procedures in step 9.
A breech insert that has been repaired on receiver assemblies 39700 and below will no longer require a reverse check. Therefore, a record should be maintained to prevent a duplication of effort.
9. Use torque wrench adapter and remove breech insert (1). Discard the breech insert if damaged. Examine the breech insert threads in the receiver assembly for damage. If the threads in the receiver assembly are not damaged, install the breech insert using the procedures on page 3-25. If the threads in the receiver assembly are damaged, install the breech insert using the procedures on page 3-26.
10. Install breech insert (1) in receiver assemblies with no thread damage as follows:
a. Clean all sealing compound residue in the receiver assembly using an M16A1/M16A2 rifle chamber cleaning brush (see TM 9-1005-24910, TM 9-1005-319-10, or TM 05538C10/1A (Marine Corps only)). Insert brush into the threaded hole and rotate several times.
b. Clean the threads of the new breech insert (1) thoroughly, using the chamber cleaning brush (see TM 9-1005-249-10, TM 9-1005-319-10, or TM 05538C10/1A (Marine Corps only)).
c. Remove all traces of oil and grease so the sealing compound will adhere properly.
d. Use surface primer (item 16, app D) to remove oil and grease and to leave a clean, dry surface. Apply surface primer on the threads in the receiver assembly and on the breech insert (1). Allow primer to dry completely.
e. Apply sealing compound (item 19, app D) to coat both the threads of the receiver assembly and the threads of the breech insert (1). Install the breech insert in the receiver assembly. Tighten the breech insert (using torque wrench adapter and torque wrench) to 50 ± 5 in.-lb (5.7 ± 0.6 N-m). Check the breech insert to make sure it is flush to 0.007 inch (0.018 cm) below the surface of the breech face. Turn the breech insert in as unserviceable if it protrudes above breech face or if it is more than 0.007 inch (0.018 cm) below the breech face.
f. Allow the repaired grenade launcher to stand for 24 hours before using to permit the sealing compound to cure.
ARMY TM 9-1010-221-23&P AIR FORCE TO 11W3-9-4-2 MARINE CORPS TM 07700A-23&P/2 NAVY SW 370-AE-MMI-010
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