Mossberg Misfire

[Turkeyman]

I mentioned a misfire I had this season with my Mossberg 930. Upon further analysis here are my conclusions. As a retired engineer I can't let a sleeping dog lie LOL.

For those of you that have Mossberg 930s if you depress the firing pin you'll see that, when the hammer hits the firing pin flush it does NOT come out the face of the bolt. Thus the firing pin hitting the primer is dependant upon the momentum of the hammer coming forward, hitting the firing pin and it's momentum to hit and depress the primer. IMO this is an error of Mossberg engineering. What if there's residue present...voila...weak hit. What if there's a bit of rust or such regarding the firing pin...voila...weak hit. Now, if the trigger spring were a bit stronger plus the firing pin a bit longer there'd not be a problem. This isn't an opinion...it's an analysis.

I also own an 835. When I depress the firing pin flush in the bolt...as when the hammer strikes it...the pin actually protrudes from the bolt face. I've never had a misfire with my 835 and I've shot many shells through it.

So those that have had LB misfires do a total analysis of the misfire.

[owlhoot]

I mentioned a misfire I had this season with my Mossberg 930. Upon further analysis here are my conclusions. As a retired engineer I can't let a sleeping dog lie LOL.

For those of you that have Mossberg 930s if you depress the firing pin you'll see that, when the hammer hits the firing pin flush it does NOT come out the face of the bolt. Thus the firing pin hitting the primer is dependant upon the momentum of the hammer coming forward, hitting the firing pin and it's momentum to hit and depress the primer. IMO this is an error of Mossberg engineering. What if there's residue present...voila...weak hit. What if there's a bit of rust or such regarding the firing pin...voila...weak hit. Now, if the trigger spring were a bit stronger plus the firing pin a bit longer there'd not be a problem. This isn't an opinion...it's an analysis.

I also own an 835. When I depress the firing pin flush in the bolt...as when the hammer strikes it...the pin actually protrudes from the bolt face. I've never had a misfire with my 835 and I've shot many shells through it.

So those that have had LB misfires do a total analysis of the misfire.

Thought most of the problems were with 835's?

[Turkeyman]

Have shot many shells thru my 835 with no problem.

[owlhoot]

Have shot many shells thru my 835 with no problem.

Got ya , I'm saying that most problems I thought that I read about were from the 835 types.
Shoot could be wrong.

[Dtrkyman]

I had issues with my sa20 firing 2 rounds consecutively, like full auto.  Only happened practicing and with target loads.

I bought the gun new and skipped a vital step when using a new gun, I never did an initial cleaning to get the packing grease off!   I soaked the entire bolt in gun cleaner and cleaned it completely, I believe that packing grease was not allowing the firing pin to retract into the bolt and when it slammed closed on the next round it would fire it.

After the cleaning I ran it through a pile of rounds without issue, all that grease can cause the pin to not move freely and possibly cause light strikes as well.

[derek]

I've had quite a few misfires with my 835.  In 2019, I changed the way I was mounting my tactacam on my gun and used a clamp on pic rail just in front of the forearm.  I thought I had enough clearance but after I did this, I misfired 3 times on 2 birds (I was able to eject and kill both).. fall of 2019 I misfired on a longbeard (which aren't the easiest to come across in the fall) and did not recover.. got a chance at redemption 2 days later and misfired again, but was able to eject and kill him.  That's when I noticed the pic rail was coming in contact just slightly with the forearm.. I ground down the forarm just enough to clear it and swore it fixed and didn't buy the new gun I was planning on buying.. 2020 no issues.. 2021 first trigger pull of the year - click..  Clicked again 2 different occasions throughout the season.  I'd clean the gun, everything seemed ok and I made it through the season ensuring I slammed the bolt all the way forward and put pressure on the forearm everytime I'd sit down to a gobbler.  That said I'm not taking any more chances and will have something different for next season.