Trigger group pin walking out on my Mossberg 500..

[.300 Weatherby Mag]

So I decided to take my Mossberg 500 12 gauge out dove hunting... Everything was great until I started shooting a good amount once the birds starting flying... The trigger pin fell out and the trigger group fell out of the gun.. Luckily I caught the trigger group before it fell into the sand... Finding the pin in the top of the sand dune I was shooting on was interesting to say the least... After cleaning the pin and putting the trigger group back in and reinserting the pin, I starting shooting again and the pin walked out a second time... But I caught it before it fell completely out the second time... Is there anything that retains the pin in a Mossberg 500.. This is my first mossberg and I only have experience with Remington and Winchester pumps... I've never had a problem with the pin in my range sessions, shooting up to four rounds of skeet.. So I'm at a loss why the pin is falling out with ammo that isn't any hotter than what I use for skeet... Thanks!!!

 

[hogdogs]

I have used custom fit electrical tape retainer discs on the receiver in the past...

Brent

 

[gyvel]

"So I'm at a loss why the pin is falling out..."

I'm guessing that you are missing what Numrich calls the "Trigger Housing Pin Retaining Spring," listed as part #60 in their online catalog ("product #54820A). If you notice, there is a circular groove cut into your trigger housing pin, and the spring rests in that groove to keep it from walking.

Here is the link: http://www.gunpartscorp.com/catalog/Products.aspx?catid=11934, but shows as sold out.

You may have to contact Mossberg for the part. They will probably send it to you for nothing.

 

[Gehrhard]

Or the channels in the pin are dirty or someone bent the spring to exert less pressure where it is needed perhaps. Maybe try "opening" the spring a tad for more pressure before you replace it if you were going to buy a new one anyway...