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Help IDing my barrel please.....

I was thinking about putting a hand guard on one of my shotguns but need to know if it is a 'heavy barrel' or not. Mossberg Customer Service says it is not (based on the serial number) despite several pictures I have sent them.

Hard for me to believe it isn't. But what say you guys ?

The shotgun is a M500A Flex Security model. 18.5" barrel (breaching), parkerized. 6 shot tube.

MossyFlex3.jpg MossyFlex4.jpg JCatsMossy4.JPG
Mossberg finally got back to me and admitted their 'mistake'. This is indeed a HEAVY barrel just as I suspected. On this model (M500A Security) they put a 590 style barrel on a '500' creating a sort of hybrid. 'Customer Service' had no information other than what the serial number told her it was and was insisting is was not a heavy barrel.