Mossberg 500 ejection issue

[BT_NVhunter]

So I have a mossberg pump waterfowl addition and it’s dropping the second shell out the bottom and only happens under recoil which makes me believe it’s getting jarred over the lip that holds the shells in the ejection tube any idea what part that would be called or a fix it idea.

 

[geetar]

I had the same problem. Very frustrating in the duck blind when it’s dropping shells. I took it apart and replaced the 3 parts posted here and cured it. Note Brownells where I got mind shows to be out of stock of them now but at least you will know what to look for elsewhere.

 

[geetar]

I did replace the cartridge stop and interruptor because mine had been used hard but I often wonder now if it could not have been cured just replacing the magazine spring. It gets weak and rusty over time in the duck hunting weather and Forgot to mention I also replaced magazine tube as mine had a lot of uneven areas from rust and water damage that the spring was hanging on.