mossberg-operator Posted September 2, 2017 Report Share Posted September 2, 2017 Got a Mossberg 500. Pullling trigger sometimes nothing happens. Ejecting cartridge, no light strike. Does it once in every 10-15 shots. Totally unpredictable when. Gansmith had a look at it twice, issue still there. Firing pin is 3 month old. Any ideas? Quote Link to comment Share on other sites More sharing options...
Stonepark Posted September 2, 2017 Report Share Posted September 2, 2017 What cartridges are you using and which bore is it? Quote Link to comment Share on other sites More sharing options...
Wingman Posted September 2, 2017 Report Share Posted September 2, 2017 Pull the trigger mechanism out (just push pins) and check for broken parts. How old is the gun? Quote Link to comment Share on other sites More sharing options...
mossberg-operator Posted September 2, 2017 Author Report Share Posted September 2, 2017 (edited) It does on any kind of cartridges from birdshot to slugs. Gun is 20yrs+, 12g. Been checked for broken parts, taken apart, back again. Edited September 2, 2017 by mossberg-operator Quote Link to comment Share on other sites More sharing options...
Fen tiger Posted September 2, 2017 Report Share Posted September 2, 2017 Clean the firing pin channel in the bolt, and there is a a washer at the rear of the the firing pin return spring, If that is absent could lead to this kind of issue.https://www.brownells.co.uk/FIRING-PIN-WASHER-1 Quote Link to comment Share on other sites More sharing options...
mossberg-operator Posted September 2, 2017 Author Report Share Posted September 2, 2017 Clean the firing pin channel in the bolt, and there is a a washer at the rear of the the firing pin return spring, If that is absent could lead to this kind of issue.https://www.brownells.co.uk/FIRING-PIN-WASHER-1. Thx for the idea! (And for everyone else, too!) Quote Link to comment Share on other sites More sharing options...
Wingman Posted September 2, 2017 Report Share Posted September 2, 2017 Sounds strange, mine is 20 years old and cycles everything and has never been unreliable. Quote Link to comment Share on other sites More sharing options...
mossberg-operator Posted September 2, 2017 Author Report Share Posted September 2, 2017 Update: washer is there... any other ideas? T Sounds strange, mine is 20 years old and cycles everything and has never been unreliable.. Is it up for sale? Quote Link to comment Share on other sites More sharing options...
fortune Posted September 2, 2017 Report Share Posted September 2, 2017 (edited) I had a situation where I sprayed chain grease into my 500 to quieten down the action. It worked very well until one cold snowy day the dog bolted a rabbit out of cover and all I got was a click. I became a beater with a fence post Mossberg for the rest of the afternoon. On inspection the grease had hardened and slowed the hammer so that it didn't have enough impact to fire the primer. Yours could be a clogged action, a broken or worn part. They are pretty robust. Apart from that it hasn't ever had a problem. The main irritation that mine has is that it is a 3"and if I stuff more than five 2-3/4 in the tube, it will try to get 2 on the elevator at the same time which takes me a bit of a technique to deal with. Edited September 2, 2017 by fortune Quote Link to comment Share on other sites More sharing options...
Wingman Posted September 2, 2017 Report Share Posted September 2, 2017 (edited) Is it up for sale? Sorry mate but no. Edited September 2, 2017 by Wingman Quote Link to comment Share on other sites More sharing options...
Wasabi Posted September 2, 2017 Report Share Posted September 2, 2017 Is the bolt locking up properly? Could it be the bolt is not locked closed and therefore the firing pin is not being struck? Quote Link to comment Share on other sites More sharing options...
mossberg-operator Posted September 2, 2017 Author Report Share Posted September 2, 2017 The issue is not permanent, once in every 10-15 shots. As far as I and the gunsmith can see it nothing unusual. Hence the question. Also got another 500, swapping bolt from that and see what happens... puzzled by this. Can not figure it out... Quote Link to comment Share on other sites More sharing options...
Fen tiger Posted September 2, 2017 Report Share Posted September 2, 2017 Weak hammer spring perhaps, this shows trigger group.https://www.youtube.com/watch?v=9waeSJjCfIU Quote Link to comment Share on other sites More sharing options...
saddler Posted September 2, 2017 Report Share Posted September 2, 2017 Try: 1. Different ammo 2. Repeat "Step 1" a few more times 3. Check the chamber is CLEAN - even stick a shotgun barrel brush into an electric drill chuck & have at it.... Then get a toothpick to make sure no residual dried grease is in the chamber rear where the cartridge rim sits 4. Get the trigger assembly out to make sure nothing is interrupting (slowing) the hammer fall - a good spray from a can of brake cleaner will shift any dried grease/carbon junk 5. Ditto for the bolt; strip it apart & make sure nothing is stopping/slowing the firing pin movement 6. Check that the barrel lock up is secure & ZERO movement in the barrel in the forward/rearward axis Pumps are basic guns, so have basic failure modes & that's IF they ever start acting up, which is not a common occurrence for this mechanism type I ran my 870 for a couple of years before noticing it had never had an ejector spring in all the time I'd owned it!! Quote Link to comment Share on other sites More sharing options...
mossberg-operator Posted September 2, 2017 Author Report Share Posted September 2, 2017 Does it with any ammo from birdshot to slugs. Will try out the rest. Step by step. Thx for the detailed guide. Quote Link to comment Share on other sites More sharing options...
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