I wonder how much velocity you can get from a .410 slug out of that barrel?
.41 diameter holes in a badguy, with quick followup shots, sounds alright for home defense. The same gun loaded with buckshot would be kind of like 3 round bursts out of a subgun, but with closer grouping.
But.....uh.....Saigas are based off of an AK action, which is much more reliable than the AR action, so if you can get a semi auto in 12 gauge, that is half the price, more reliable, and in 12 gauge, why would you pay so much for the .410 M16?