.22 model 99 Marlin misfiring

[nekwah]

I own a model 99 Marlin semi-auto .22 that has a bad problem of misfiring. It was passed down to me by my dad. This is a fairly old rifle made sometime in the 60s i think. Specialty ammo seems to function a little better but not much. The firing pin comes down, theres a mark on the shell, but does not cause the cartridge to fire. Ive cleaned this gun well so i dont think its gunk causing the problem. Ive wondered if the spring is worn out causing it to not hit the shell hard enough but not sure. Any ideas.

 

[rangerruck]

have you thoroughly cleaned the bolt assy? let it soak in some brake cleaner for a day, then spray it out with hard spray water, especially into where the firing pin is. then dry and lube. if still no worky, it is not too uncommon that the firing pin is mishaped, broken a little piece, jagged, etc.
you may need a new firing pin.

 

[mnrivrat]

First is of course the cleaning. Particular attention should also be paid to the little slots between the barrel and receiver where the extractors set into when the bolt is closed.

You have to use a small pick of some nature to clean them out or they will build up enough residue to keep the bolt from completly closing. (make sure you get the back one as well as the front)

Then also the usual area's of the bolt and the upper channel where the firing pin rides .

If that is all clear and clean, then what's left is the firing pin itself, followed by the hammer spring. My bet would be that the hammer spring is the least likely to be a problem.

 

[lipadj46]

I'm not sure of the Semi but my father's Marlin 30-30 recently had a case of the FTFs. I fixed it my completely disassembling the bolt and soaking the bolt, firing pin, ejector, and extractor in CLP and cleaning it good with fine steel wool and pipe cleaners. Pretty much the bolt innards get all gunked up and when the hammer drops the firing pin sticks.