I'm not sure if anyone is aware, but the glorious "Liberator" high end assault rifle in the game is also the name of a real gun.
Behold, the FP-45 "Liberator" : https://upload.wikimedia.org/wikipedia/commons/thumb/1/15/M1942_liberator.jpg/300px-M1942_liberator.jpg
1 million were made in 11 weeks by 300 workers at a plant in Indiana for use of air dropping them (with a 10-round box of .45 ammo) into German-occupied territories for use by resistance forces during World War 2. They cost ~$2.40 each to make delivered ($32 in 2010 dollars), and were only loaded with a single round at a time.
Only around 25,000 pistols were actually distributed via the UK into France of the 500,000+ shipped to