I bought a used Comp 1 , that has choke tubes installed.
I know that they are not factory, but after market.
One tube has I Mod etched along the side by what looks like one of those engraving pens was used.
The second tune has L F and Lead Shot etched along the side, this one looks like a factory marking.
I do not see any brand markings on either tubes. I think they are Beretta Optima style tubes, based on the threads being 2 3/4” from the bottom of tube.
Just wanting to see if anybody had a better idea about determining tube style.