All three designs of the winchoke interchange, The third design was the flush choke
Only the winchester model 59 was different it had a Versalite choke
I have a Stan Baker fitted trap barrel here somewhere for one of my 870 tc's that have the initial version that came out in 69, he also did the forcing cone
He called them the " money maker" and was way ahead of his time backboring
Some old trap shooters here hint hint

may remember Stan or his name/barrels it was not hard to tell someone was using one. They had a different bark to them
Winchester had tubes six years ahead of remington when they tried a few briley square threads in 1985 then finally settled almost 2 years later on the remchoke
I have one 1985 1100 rem fitted with that rare briley choke tube factory
Cheers