If the weapon still does not fire, the gunner clears the weapon, identifies the problem and then takes corrective action to fix or report the problem.
a. Bad Ammunition. Bad ammunition can cause a stoppage and is checked first.
(1) Primer on the Ejected Round is Indented. Clear the weapon and check to see if the primer is indented. If the primer is indented, it is a bad round and dispose of it as authorized. Reload the weapon and continue with the exercise.
(2) The Primer is Not Indented. Clear the weapon and check to see if the primer is indented. If the primer is not indented, then the firing pin can be bad. Turn the MK19 into unit level maintenance.
(3) Round on Bolt Face. Clear the weapon. If the round remains on the bolt face, remove the round and place the weapon on S (SAFE) with the bolt to the rear. Check the primer and see if it is indented. See the aforementioned steps for the corrective action.
b. Ammunition Jammed in Feeder. A misfire might occur due to ammunition jammed in feeder. Clear the weapon and put gun on S (SAFE).
(1) Feed Throat Improperly Attached. Check for proper attachment of the feed throat. If the feed throat is attached incorrectly, then re-attach it and reload. Try to recharge and fire the weapon. If charging is not possible, go to BOLT JAMMED.
(2) Rounds Crooked or Not Seated Firmly. Clear the weapon. If the rounds are crooked or not seated firmly, remove the linked ammunition from feeder. Ensure the link band is even and adjacent to copper band all around ammo. Reload and continue with the exercise.
(3) Broken Link. A broken link can cause the weapon to stop firing. Clear the weapon. If the link is inside the weapon, remove the link. If it is still on the round, then remove the round and dispose it as authorized. Reload and continue with the exercise.
(4) Link Off Rotating Band. Clear the weapon. Remove round from belt, dispose of round as authorized. Reload and continue with the exercise.
(5) Female Link Not First. A round loaded with the female link not first will cause a stoppage. Clear the weapon. Reload the weapon and ensure that the female link is first.
c. Bad Firing Pin. A stoppage might occur due to a bad firing pin or firing pin spring. A possible bad firing pin can be determined while checking for a bad round.
(1) Primer on Ejected Round Not Indented. Clear the weapon. If the primer on the ejected round is not indented, then the firing pin may be bad. Report the defect to the unit armorer.
(2) Firing Pin Tip Fails to Spring Forward. Clear the weapon. If the firing pin tip fails to spring forward then the firing pin spring can be bad. Report the defect to the unit armorer.
d. Defective Feeder or Feed Slide Assembly. A misfire might occur due to a defective feeder or feed slide assembly.
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