help with choke id

[fishshocker]

I had a glenfield 788 12 guage drilled and tapped for choke tubes 15+ years ago. Gunsmith included 3 chokes with it. I know those guns are cheap and not feasible for spending money to upgrade but it was a family hand down that I wanted to make usable since it was fixed full choke. Anyway, the place that did it is long since closed and now I want to buy some other chokes for it. I have no idea which ones to get. Attached is a pic of two of them on the right, there are two Rem chokes on the left for comparing.

Also, how/can I determine if steel is safe in these?

Thoughts.

 

[reckless carolinian]

Some Micrometers will get you the I.D. (Inside Diameter) which gives you the constriction. Your LGS may be able to, and a machine shop or tool and die shop can surely measure the thread pitch for you.

 

[Steve A]

See if the Rem Choke will screw into the barrel, if it fits, it would be ok to use even if it protrudes out of the barrel.

 

[Dave McCracken]

Quite possibly it's the old Truchoke, AKA .795"X44TPI.

But do not guess. Send it off to Briley's or Carlson's, they'll match it up.

 

[fishshocker]

It may be tru choke.
My calipers show just under 0.8 inch od and best I can count it is 44tpi.
Overall length is 1.6inches, but I have yet to find the length of tru chokes online yet.