Barrel length has no bearing on pattern. Longer barreled shotguns are perferred because of the longer sight plain for sporting clays shooting and bird hunting.
An 18'' barrel on a HD shotgun has it's advantages for close quarters.
I would guess any company set up to do barrel work could install a poly choke for you. It certainly makes changing the pattern spread a lot quicker than screw in chokes. {if that's your desire}
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