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I decided to go without. Installing the Aimpoint t-1 and dont see the need for backups. Its good for like 8 years continuous use... and Invasion/Zombies are really not a priority.
Either DD or Troy are solid products, as well as several others such as Knights, ARMS, Cav Arms, GGandG, and PRI.
The difference between folders and fixed is all a matter of application. If you run an optic then a folding rear is likely a necessity. If you run a reddot and don't mind a partially obstructed view(1/3 co-witness or absolute) then a fixed rear is an option. As for front sights, it doesn't really matter. A fixed FSB is a non issue with magnified optics but some still insist on having a clear FOV. The caveat to this is the use of a tritium front sight and magnified optics. Under low/no light conditions the tritium post will produce a green glow that appears in your optic rendering it useless. For the sake of clean lines and consistency, a lot of folks who run a folding rear also run a folding front.