my mossberg 500a misfires

[ineedmoney]

i just got it,and i know it is atleast 15 years old,has been used but not alot, enough to break it in real good. But i really dont think it has ever been cleaned, beside's me. it did ok the first 10 remington shot's but after that it started to missfire i have had 4 out of 25 rounds missfire , i could load them right back up and it would shoot them. i noticed the primers look like the firing pin barely hit it. what is the main reason this happens?

 

[AcceptableUserName]

have you fieldstripped and cleaned it, by chance? if it's weak firing pin it's a pretty cheap and easy replacement but it may not be necessary

 

[ineedmoney]

yeah i field stipped it and sprayed the bolt with hoppes elite let it stand a few min. then blew out with the air compressor... do you think it could be the remington 100 pack?

i kinda think it might need a new hammer spring?

will the hammer spring weaken enough to make it misfire, if the gun has sit for a long time with the hammer cocked?

 

[jojosdad]

No - springs get weak from being flexed, as when they're used. Storing a spring in it's compressed state won't weaken or break it, unless the spring is tempered wrong, or the steel is too soft.

 

[hub]

I would call Mossberg's customer service. Or at least ask for parts. You said your having light primer strikes. I would ask them what they think, which they will probably tell you to send it in or to a Mossberg gunsmith.

Then if that's what they told me I would probably get a new firing pin, and spring. It's probably bent a little or the tip broken. I would take it all down and clean it really good too. I just don't think being dirty or old is the problem. I guess it could be a weak hammer spring too.

 

[BADUNAME37]

Like others have stated. The obvious approach would be firing pin and spring and new hammer spring. It shouldn't be very difficult to disassemble if you are careful about springs flying, small parts flying and the like! While you are at it, there could be old, hardened grease or even dirt in where the firing pin travels within the bolt. Any of the aforementioned items could slow down firing pin operation.

It may be you could disassemble and find the culprit without having to buy anything, however the parts would probably be less cost then your shipping it back to Mossberg, insured.

 

[RandKL]

Did you ask this same thing yesterday?

r

 

[ineedmoney]

ok i will clean it really good and go from there. thanks for the help!!

yes i did ask something similar yesterday but it was under a different thread and i wanted more opinions so i started a new tread.

does anybody think it could just be the ammo?

 

[AcceptableUserName]

i doubt the ammo would have that many bad apoples. worst case scenario it's the firing pin. and that isn't anything that can't be easily and readily replaced