• Bolt Bounce/ Carrier Bounce.

  • Ensure the bolt carrier is fully forward before firing, if the carrier bounces rearward off the barrel extension and remains partially off the barrel extension face, the firing pin cannot protrude far enough to strike the primer causing a light primer strike or no primer strike at all.

  • Worn out buffer spring, replace

  • Worn out carrier extension spring, replace

  • Bolt speeds are too high, restrict gas with adjustable gas block, try different ammunition

  • Dirty or dry action, lubricate and clean rifle

  • Suppressor causing too much backpressure, restrict gas with adjustable gas block, try different ammunition, try different suppressor

  • Releasing bolt forward too slowly with charging handle, try releasing the bolt forward by pressing on the paddle of the bolt catch

  • Too many rounds in magazine creating drag, ensure magazine is not overloaded

  • Check to ensure firing pin is in good condition and is assembled correctly.

  • Defective ammunition. Discard ammunition and reload with new ammunition.

  • Too much oil/preservative/CLP in firing pin recess.

  • Magazine or chamber is not loaded, reload.

  • Failure to ExtractDirty or corroded ammunition, clean chamber and use new, clean ammunition.Broken or worn extractor spring. Replace extractor spring.

  • Broken or worn extractor. Replace extractor.

  • Fouling or carbon on extractor. Clean bolt, extractor and chamber.

  • Carbon or dirty chamber. Clean chamber and barrel extension.

  • Extractor tore case rim, Adjust gas block to lower setting or use different ammunition and/or suppressor