As someone who has shot trap with a Saiga-12 (converted and unconverted) I can assure you, trap is not it's strong suit.
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the "local" gun shop had (and, probably still has) a kick ass special on semi auto 20 gauge shotguns.
they may still have some 12s.
I thought about threading for a choke on my 590, but, not for skeet. for home defense.
it's do-able, but, not exactly inexpensive.