Mossberg trench gun that isn't a 590

[vit]

Picked up a beat up Mossberg trench/riot gun last week . Never had seen this configuration before - 7 shot tube and bayonet lug. 500ATP. Turns out these were made in the second half of the 70's and early 80's - before 590 was introduced.
Unfortunately I neglected to take a "before" picture - stock had been painted at some time black, stripped, leaving it almost blonde with remnants of black paint. Receiver was worn, barrel and mag tube were blotchy worn light gray.
I did an economy refinish - barrel and mag tube reblued, receiver painted.
I think it came out passable.
I'm guessing it may have been used by LE or corrections agency.

[Silentkilla01]

Oh what a nice find! I will give you 200 on it today?!!!!! lol that's neat as hell! That m-7 on the end sets that bitch off!

[vit]

[Silentkilla01]

SWEET!!!!!!!!!! They freaking rock bro!

[FunkyPertwee]

Nice old school shotty. It would look good next to a Smith revolver and nice lever action.

[imanaknut]

Nice find. Looks good in the photos!

[Schuetzenman]

Looks like you did a great job. Congrats. I love a bayonet equipable weapon!

[Full Otto]

That turned out real nice and in short order if you just got it last week

[davepool]

That looks like the shotgun i carried on guard duty when i was in the Marines in the early 70's

[NAPOTS]

what product did you use to reblue the steel parts?

[skorpion]

Nice find, I like the wood and lack of a heat shield. Does it have the metal trigger group?

[vit]

Used Tetra Gun cold blue, ran out of that, finished with Birchwood Casey cold blue.
Plastic trigger guard. Nobody has seen one broken yet, so I'm fine with that.