I have a couple Moss 590s that I'd like to have chokes installed for potential bird shot use. What's the best route to go? I assume I could buy a choke "kit" and have a gunsmith install it, but I want to make sure I'm buying the correct one.
Does it matter if I have heavy walled or thin walled 590 barrels?
Which is the best one to buy? Do I actually buy something that a gunsmith threads into my barrel to interface with the chokes? Or is it just a matter of my gunsmith threading out the inside of the barrel to the proper thread/pitch so that the chokes can be screwed in directly into the barrel? (Sort of like the inverted version of a suppressor being threaded onto the outside of a barrel).
My purpose is to take a pair of 590s that have longer barrels and allow them to be useful with birdshot as needed by threaded chokes in. Without me having to buy a dedicated pre-choked shotgun, which I do not have space in my gunsafe for. So even if the gunsmithing cost is on par with a whole new gun, I'd still go the gunsmithing route. Also, I want one of the shotguns to become a 50-state legal travel shotgun so the ability to have it be already configured in a useful defensive manner, but be able to thread in a choke and have it be useful on birds or clay pigeons, is appealing to me in a single gun.
Anything I didn't ask that I should know?