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Ask ProShooter Your Own Question

ProShooter, Firearms Instructor
Category: Firearms
Satisfied Customers: 3840
Experience:  Certified Firearms Instructor and Glock Certified Armorer.
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Just bought a Mossberg 500 field slug combo pump action 20

Customer Question

Just bought a Mossberg 500 field slug combo pump action 20 gauge. Every time I fire a round the action opens half way. I have never experienced this in any other pump. Is this normal?
JA: How can the Gunsmith help you with your firearm? Please tell me everything you can so the Gunsmith can help you best.
Customer: upon firing a round the breech half opens
JA: Is there anything else the Gunsmith should be aware of?
Customer: all other aspects of the weapon works fine. the gun still ejects the round and reloads fine
Submitted: 1 month ago.
Category: Firearms
Expert:  ProShooter replied 1 month ago.

Good morning. My name is ***** ***** I am happy to help! It definitely sounds like something is mechanically wrong....perhaps the action lock or similar. Obviously, its impossible for me to completely diagnose the issue over the internet.

If you just bought the gun, it should still be under warranty. I would suggest contacting Mossberg customer service quickly and have the gun looked at by them. -

Please let me know if you have any other questions....


Expert:  ProShooter replied 1 month ago.

Do you need anything further?

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