Quick Choke

[bill338]

Hi i picked up a couple old remington 1100s one in 3" magnum it has on it a "quick choke" it is an external thread choke tube, does anyone know anything about these?, of if they are still available? I belive the one i have has a 1 mm choke to it
Thanka

 

[REM700J]

My only experience with that is a poly choke designed amd used on the old mossburg bolt actions. I think the modle number was 175k maybe? I recall seeing a screwing model for modern guns in the last few years but can't remember where. Neat idea. Never found it patterned particularly well though.