Who the fuck buys this shit? I mean nazis, obviously, but this is so fucking tacky and cringe I shudder to imagine the sort of sad sack that feels the need to mod their 20-year-old game console to affirm their obsessive wehraboo tendencies
These were the among the first suggestions that popped up when I searched for Xbox 360 controller button replacements, btw 
Yeah 9mm Luger, 9mm Parabellum, 9mm NATO, and 9x19mm are all names for the same common 9mm round everyone uses.
Also Speer is an American ammo company iirc.