OK, here's the deal: For my 16th birthday (14 years ago), Grandpa gave me one of his old 12-gauge pump shotguns. It was a cheapie (as most of his guns were), a Western Field XNH-560. Gunparts.com cross-reference indicates this was a Mongomery Ward's branded gun and the actual gun was a Noble model 60. I have no idea when it was made or purchased, but it's old.
The gun has attached to the end a poly-choke, which is basically a muzzle brake looking device that screws in and out to set the choke pattern for different yardages. I want to know if this choke is removable, and if I can run the gun either without chokes or (preferably) have the muzzle end threaded to accept modern choke tubes. Here are some pictures of the choke; I apologize if they're not the greatest quality, I'm still improving at my gun photography.
Image of the end of the barrel plus the choke:

Close-up of the choke with the shroud removed; you can see the "petals" inside and that the choke has a pretty tight fit to the end of the barrel:

Close-up of the choke shroud; this is the part that turns to adjust the choke. It's a blurry picture (no macro setting on this ****** camera), but it has markings that read "MAGNUM", "MASTER SHOOTING", and yardage markings from 5 all the way up to 40 in 5-yard increments:

Does anybody know anything about these? I can't find a gunsmith that is willing to give it the time of day. I guess if all else fails I could just have the thing cut off and the muzzle threaded, but I'd much rather just remove it if I can. Any ideas? Many thanks.
The gun has attached to the end a poly-choke, which is basically a muzzle brake looking device that screws in and out to set the choke pattern for different yardages. I want to know if this choke is removable, and if I can run the gun either without chokes or (preferably) have the muzzle end threaded to accept modern choke tubes. Here are some pictures of the choke; I apologize if they're not the greatest quality, I'm still improving at my gun photography.
Image of the end of the barrel plus the choke:

Close-up of the choke with the shroud removed; you can see the "petals" inside and that the choke has a pretty tight fit to the end of the barrel:

Close-up of the choke shroud; this is the part that turns to adjust the choke. It's a blurry picture (no macro setting on this ****** camera), but it has markings that read "MAGNUM", "MASTER SHOOTING", and yardage markings from 5 all the way up to 40 in 5-yard increments:

Does anybody know anything about these? I can't find a gunsmith that is willing to give it the time of day. I guess if all else fails I could just have the thing cut off and the muzzle threaded, but I'd much rather just remove it if I can. Any ideas? Many thanks.

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