- Nov 9, 2013
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Tom Clancy's Rainbow Six: Lockdown - Wikipedia
en.m.wikipedia.org
I think iron sights is essential for a first person shooter.
I also think it's essential for a "Tactical Shooter" to have doors you can open close, without that I don't think you can really call it a "Tactical Shooter"
Rainbow six lockdown was the first game to have both of these features together.