Wow! You can certainly round them up.
It seems the gov'nor bought some fancy shotguns for military use?

Trying to wrap my head around that compensator. Nice ones.

 

It is a Cutts compensator. They were installed on military training shotguns along with Poly Chokes. I could probably unsolder the Cutts and reinstall the sight bead to restore it back to a riot shotgun. The barrel is the correct length and the serial number is in the correct range. However, the barrel serial number is not the same but falls into the riot shotgun serial number range. The barrel may have been switched when the Cutts was installed. An auction a week before had the exact same shotgun. It went for more than I wanted to pay.

 

The problem with restoring a gun that has a polychoke or Cutts compensator is that frequently the ends of the barrel were threaded to mount the device. I’ve see a machinist turn down the threaded end and make a patch sleeve that fits and then is hammered at the seam. This works well on trench guns because the heat shield/bayonet lug covers the patch but is harder to make look right on riot guns.

 

I am going to leave as is. The Cutts on this gun appears to be soldered one. When I look down the muzzle, I can see the hole where the original bead sight was.

 

It has most likely been installed correctly then...with solder and the outside end of the barrel threaded. Hard to undo, I have an M620 riot with an interchangeable choke tube set up that’s in a similar situation.

 

On another variable choke gun, the 520 I bought a couple weeks ago that was advertised to have a Poly Choke, in fact has a Herter's choke. The search goes on. I found a 20 gauge 520 barrel at gun parts with a delux poly choke. I just couldn't pass it up. How can I tell if it is a factory install or an aftermarket install? Thanks.

 

Chris,
Check out my ID blog and look at the Sears ads for the 1939 Model 520 and the 1941 Model 520A for pictures of the factory polychokes.

Model 620s and 620As had more variety with several different adjustable choke options.