View Full Version : 12ga missfires

October 30, 2011, 06:11 PM
I've got a mossberg 535, and have taken it to the range 3 separate times. Each time i have a handful of misfires, I'd say maybe 10% of the time it happens. I've examined some of the shells i've used winchester target loads, and some cheap 5$ federal box. the federal stuff usually is the worst, but it happens with the winchester stuff too. When i get a misfire, i look at the primer and there is a tiny indent where the firing pin hit, but not enough for it to go off

i'm wondering if something is wrong with the firing pin spring.? if i get a misfire, i usually just open the chamber up slightly and then put the shell back in and it will fire the 2nd time.

What do you guys think the issue is?

October 30, 2011, 06:19 PM
It's the gun. Send it back to mossberg.

October 30, 2011, 06:21 PM
Give the gun a good cleaning, I don't mean the barrel, but the trigger/ hammer group. You may have dried oil/grease in the action preventing good firing pin strikes. While yor at it clean the breech blok there may be dried grease in the firing pin softening the hammer hits.

October 30, 2011, 06:26 PM
I'm with Jaguar, give it a thorough cleaning and try again. At that point, Mossberg Customer Service needs a call. :D

October 30, 2011, 08:07 PM
i cleaned it out good and will see how it works this saturday. thanks for the replies.

October 30, 2011, 08:35 PM
Yes on cleaning, but before turning it over to Mossbert, if you still have a problem, take a look at the firing pin and spring. If this is beyond warranty, how much does it cost to r&r he firing pin and spring compared to sending it to Mossberg and is it soemthing the consumer can do or does the OP need a gunsmith?

October 30, 2011, 08:48 PM
I imagine that if the OP is relatively handy/mechanicaly inclined, it's no problem for him to replace those parts himself, if he can get them. I personally have never tried to order parts for Mossberg firearms, so I don't know if they are readily available.

October 30, 2011, 09:09 PM
If the 500 is like the 535, it is simple. Google mossberg firing pin spring.

October 31, 2011, 11:04 AM
Well when i took apart the gun i looked at the bolt, bolt block, firing pin, and firing pin spring. All parts looked to be in working order, so maybe all it needed was a good cleaning. I'll find out soon enough if it needs to be worked on further.

October 31, 2011, 09:45 PM
Look at the shells that misfired. Look at how deep the primer is seated. Sometimes they are really sunk in there and the firing pin is simply too short to get a good strike. I've seen high dollar guns misfire a crappy shell. Sometimes it is just the shells, not the gun.

November 2, 2011, 02:11 PM
I took the gun to the range and ran about 50 or so shells through it. The first shell misfired twice, I took it out, reloaded it and it fired on the 3rd pull of the trigger. After that the gun ran fine. I can't remember if the first shell I used was one of the crappy federals, but either way I used the winchester stuff after that and it all worked and cycled fine, so hopefully I fixed the issue with just a good cleaning.

November 2, 2011, 10:32 PM
There does seem to be a difference in the hardness or possibly the depth of the primer among various brands of shells. In one of my 16 ga sxs's, Remiginton Game loads have the shallowest firing pin penetration. Federal and Winchester are a little deeper and Fiocchi's exhibit the deepest penetration.