I presently have a Mossberg 500 with 26" Polychoke barrel and B-square sidesaddle scope mount, and a Mossberg 590 Security model with 20" cylinder bore, sidesaddle shell holder, bead sites, and is drilled and tapped for a scope. Starting from here, which seems like a better choice for deer hunting? Basically, what difference would the longer barrel and polychoke make, good or bad, and is it worth shelling out for a scope rail (under $10). It would be used by a friend of mine who doesn't have much gun experience. The alternative to these two is my idea of temporarily adapting my SKS-D to manual cycling.