It is marked on the screw-in tube. I'm currently trying to erase from my mind the picture of a sweet little 42 with a big Friggin knob out on the end of the barrell.
Alan
Amen!
40+ years ago, there were a lot of guys on the skeet circuit shooting Model 42's with knobs on the end of the barrels.....
Mine did NOT have the knob on the end.