AR10 16''brl.. Red dot or scope ??

***SPF*** I have a Springfield M1A Socom in Sage EBR stock with night sights, 2 stage trigger, (3) 20 round magazines, a picatinny rail in the stripper clip guide, a picatinny rail on the bottom of the handguard (for vertical foregrip/bipod), and an extra top rail to accommodate either medium...