General information which can be helpful if A) you want to know what choke your barrels are & B) you're curious if your barrel's chokes have ben opened up in the past.
The only way to really tell choke constriction is through measuring but the numbers on the underside of the barrels ahead of the flats will tell you what it was made as from the factory.
0. Cylinder
1. Imp. Cyl
2. Modified
3. Imp. Mod.
4. Ful
If anyone has additional information, please add.
Choke Designations
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