Mossberg 500 safety problem

[don1911]

I just bought an older Mossberg 500A. 12 ga. 29" barrel. Installed 20" barrel with longer tube. Now I notice that when gun is pumped the safety/fire button will move. About 10% of the time it will move enough to put it into safety and will not fire until button is pushed forward to fire position.

I disassembled it enough to remove the safety parts and cleaned them up real good. Also made sure screw was good and tight. Still does it.

Anyone out there experience similar problem? How did you fix it?

Thanks in advance.

 

[itchin]

You may have lost the detent ball. Buy a metal safety with a new spring and detent ball.

 

[don1911]

Detention ball and spring are there.

 

[don1911]

The detent ball did not come out when I removed safety. It is held in place there. Should it have popped out? Maybe that's my problem. It has spring under it. I can push it down it comes back up to original position when I remove pressure. It stays in place when I turn it upside down too. I cleaned everything real good. What would be holding it in there? Not sure how to get it out.

 

[itchin]

I think it would have fell out when you turned it upside down. Maybe there is gunk in there preventing it to come out enough to keep the safety in place? Or maybe the spring is weak? I don't know. The plastic safety on mossbergs is a weak point anyway. It's a good idea to replace them with a metal one anyway, because it is common for them to break. They're cheap and usually come with a new spring and detent ball. If you plan on keeping the plastic safety maybe get the ball out and clean up the hole with a dental pick, just in case there is gunk in there.

 

[Bozz10mm]

Probably the detent ball is stuck. It should fall out when you remove the safety switch. As in this video.

 

[BRD@66]

I'm sorry to hear that Mossberg still has this weak point. The thumb safety is a good idea on paper - especially for lefties, but it is why I burned bridges w Mossberg shotties & went with Remington nearly 40 years ago. Good luck.

 

[A.Texas.Yankee]

That detent ball should be popping out pretty easy. I've lost all few due to that! Grab a metal safety and new spring and ball; worth it. You can look at paddle safeties that are larger and much more "tactical" (easier to switch off) for SHTF scenarios.

 

[don1911]

Thanks for info. I've ordered all those parts then some more. Gonna rebuild the safety. Ordered both metal and oversized switches. Try em both. Thanks.

 

[trentward86]

I also had this happen with a M500 and replacing the detent ball fixed my issues right up!