Mossberg barrel device of some sort

[Emri]

Now that I see the threaded portion on the front end I will guess it is for a "moderator". Yeah, just leave it off.

FWIW,

Emri

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[Jinx]

It's stamped "144" on top of it. Hmmmmm. Too corse a thread for a silencer.
I know! You are missing a cup that went with it, holds a golfball and you launch it with .22cal blanks!
Nope? Not'a clue here then!
I'll buy it off ya' for 5 bucks just to add to my collection of weird useless things added to a rifle! Seriously!

[emmagee1917]

Well , they used what they had. USS course was supplimented with SAE fine threads in the '30s. My USMC .22 Reising was threaded for a suppressor in WW2 and they used the new 9/16 SAE threads on it. It's worked fine so far with a modern suppressor made up to look kinda like a Maxim.
Chris