On my 20 Gauge O/U the chokes do not say what kind they are. But they do have this little notches on the end of them. One has 4 and the other has 3. So I guess that is what says what kind of choke they are. Does anyone know anything about this?
First, the gun is Stoeger. Do the chokes unscrew from the gun? If it does, they usually say on the side. If it doesn't, I would guess that they are Modified and Improved Cylinder. If all else fails, you can take them to a gunsmith and he can tell you what they are.