I should have came here first because the manufacturer had no clue. I have a 20ga Pardner Compact its a standard smooth bore modified choke. I plan on upgrading to the F920 barrel and an ATI stock. I am looking for the outside diameter of the barrel so that I can make sure that the forearm will fit. Any help would be great. I already know that the mounting screw hole is correct but I don't know what the outer diameter of the barrel is.
TJ
P.S. H&R told me that they didn't have that information.