User blog comment:AntiScootaTwo/Advanced Warfare Multiplayer Reveal Trailer released/@comment-6343006-20140811194458/@comment-25262958-20140812024458

Here is a list of technology that existed attachment wise during the WWII time period: FMJ, suppressors, extended mags, foregrips, collapsable stocks, battery powered and refractor reddot sights (they were primative but got the job done), long barrel, slugs, the black ops 1 acog sight, fast mags, tac knives, upgradable iron sights, flash suppressor, akimbo, rapid fire, select fire, bipod, grenade launcher, and bayonet. These are all I can think of, were all of them used in combat during WWII? No, but if a developer wanted to put them in there they could justify putting it in there.