My last resort!
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 up grading 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.
P.S. H&R told me that they didnt have that information.