Mossy 500 AT Problem

zanthope · October 25, 2001, 09:15 AM

I have a 12-gauge Mossy 500 AT that's about 20 years old. It's had a pretty easy life - I haven't shot it a lot - not obviously worn out at all.

Yesterday I took it out and shot some slugs and tactical buckshot out of it, and the gun was acting like it was a semi-auto. With most shots, the action opened itself up and sometime ejected the shell.

It wasn't a strong cycling like you'd expect out of a semi-auto. It just opened up enough to eject, and sometimes partially eject the hull, which of course caused it to jam.

It's as though something was out of time, or maybe some lock-up component is worn out. I wondered if I was causing it - by gripping the foream and reacting to the recoil...yanking it back... but I shot it one-armed and it did the same thing.

Anybody have any ideas?

__________________

Dave McC · October 25, 2001, 11:09 AM

Sounds to me like it's just getting broke in.See the recent thread on 870 jams....

zanthope · October 25, 2001, 12:31 PM

Dave McC...thanks for the reply.

If anything, mine is the opposite of the 870 thread ... mine is (I think) too loose. Something is disengaging when it shouldn't be.

Poodleshooter · October 25, 2001, 03:39 PM

13yr old Mossberg 500 here. My Mossy does the same thing with various magnum loads. I actually appreciate it, as it speeds my pumping effort, especially when pass shooting geese. Heck, Winchester brags about the 1300 doing this, using it as a sales pitch "the pump action that thinks it's a semi-auto".

October 25, 2001, 09:15 AM	#1
zanthope Senior Member Join Date: November 20, 2000 Location: Ohio Posts: 258	Mossy 500 AT Problem I have a 12-gauge Mossy 500 AT that's about 20 years old. It's had a pretty easy life - I haven't shot it a lot - not obviously worn out at all. Yesterday I took it out and shot some slugs and tactical buckshot out of it, and the gun was acting like it was a semi-auto. With most shots, the action opened itself up and sometime ejected the shell. It wasn't a strong cycling like you'd expect out of a semi-auto. It just opened up enough to eject, and sometimes partially eject the hull, which of course caused it to jam. It's as though something was out of time, or maybe some lock-up component is worn out. I wondered if I was causing it - by gripping the foream and reacting to the recoil...yanking it back... but I shot it one-armed and it did the same thing. Anybody have any ideas? __________________ __________________ We are born naked, wet, and hungry. Then it gets worse.

October 25, 2001, 12:31 PM	#3
zanthope Senior Member Join Date: November 20, 2000 Location: Ohio Posts: 258	Dave McC...thanks for the reply. If anything, mine is the opposite of the 870 thread ... mine is (I think) too loose. Something is disengaging when it shouldn't be. __________________ We are born naked, wet, and hungry. Then it gets worse.

October 25, 2001, 11:09 AM	#2
Dave McC Staff In Memoriam Join Date: October 13, 1999 Location: Columbia, Md, USA Posts: 8,811	Sounds to me like it's just getting broke in.See the recent thread on 870 jams....

October 25, 2001, 03:39 PM	#4
Poodleshooter Senior Member Join Date: August 7, 2000 Location: Floating down the James River in VA Posts: 2,599	13yr old Mossberg 500 here. My Mossy does the same thing with various magnum loads. I actually appreciate it, as it speeds my pumping effort, especially when pass shooting geese. Heck, Winchester brags about the 1300 doing this, using it as a sales pitch "the pump action that thinks it's a semi-auto".