My first shotgun was a Win 1300 pump and it was a fixed full.
My second shotgun was a Remington Sportsman and it too was a full choke, it was not until
1988 that I bought an 870 Wingmaster that I was using a Remchoked gun.
Steel shot and a Modified tube be it over decoys or pass shooting Honkers , Snowies or Brant on the beach in Tsawwassen.
IC never did see the inner threads of the barrel, but that choke does have an application, but on the Salt March near YVR I never found a use for it.
Others have and they continue to have great success.
Best Regards,
Rob