Nope, one of my best friends designed and manufactures CompNChoke and Gobblin Thunder choke tubes, just a short drive from my house. The machine shop there does excellent barrel work as well. They offered me the opportunity to test all their different constrictions, on their pattern plate, with my loads, to determine the "sweet spot", then buy the one I want.

Hard to turn down a deal like that.

May God bless America and those who defend her.