Ithaca M37 Vietnam Trench?

[browningautorifle]

I put the Dime on and it wont go in,

Wow...that's new. I very much doubt it's a military gun still. Riot barrels should be a cylinder bore. There are a few guys around here that can shed light, Tom Doniphon being one. They'll be along anyway.

Here's another place to ask... 1942 M37 Riot gun questions | Shotgun Forum