In the process of trying chokes in my new Stevens 301 20ga I ended up with two .575's so I'd swap this one for something else threaded for the Stevens. the other .575 is a Carlson's ported and my grandson says it looks cooler so this one goes. they shoot the same only difference is ported vs non-ported. I'd like to try a .560, a .565, a .568. a .570 or a .572 or, I'd ship it lower 48 via the USPS for $32.50 (PP preferred no fees on me) or a Postal MO.
fits Mossberg, Winchester, Browning Invector (not Plus), H&R, NEF, Stevens 301 and maybe more.
thanks for lookin'