M203
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M203 Trouble Shooting

1. FAILURE TO FIRE

    Step 1. Check for dirt in firing pin.
      Clean firing pin recess.
    Step 2. Check for dirt in cartridge Iocator slot.
      Clean cartridge Iocator slot.
    Step 3. Check for water or oil in firing pin recess.
      Point muzzle up and handfunction barrel and firing mechanism.
       
    Step 4. Check for broken or improperly assembled parts of firing mechanism.
    Step 5. Check for defective cartridge Iocator spring :
      a. Using cleaning rod section, push cartridge Iocator toward muzzle, and then release.
      b. Cartridge Iocator must move forward and back under spring pressure.

2. FAILURE TO EXTRACT.

    Step 1. Check for stuck cartridge case  in barrel.
      Remove case by tapping with rifle cleaning rod.
    Step 2. Check for broken or missing extractor, spring pin, or spring.
      Replace extractor, spring pin,or spring if broken or missing.

3. FAILURE TO LOCK.
 

    Check for dirty follower or receiver cavity.
      a. Remove back plate and follower
      b. Clean and lubricate back plate and follower
      c. Clean and lubricate trigger housing

4. FAILURE OF THE LEAF SIGHT ASSEMBLY TO REMAIN AT THE SELECTED RANGE.

    Step 1. Check for loose screw  on front folding leaf sight assembly .
      Tighten screw.
    Step 2. Check for loose screws  on sight leaf base.
      Tighten screws.

5. FAILURE OF QUADRANT SIGHT ASSEMBLY TO STAY IN SELECTED POSITION.

    Check quadrant sight assembly for damage (broken quadrant locator teeth. bent or damaged parts).