Nope, 12.7mm is a hangun cartridge and .50BMG is a rifle/machine gun round.

I'm not sure why they label one 12.7mm and the other .50 MG. They could have just as easily labeled the 12.7mm as .50 pistol. .50 and 12.7mm are the same caliber. For those of you who don't know, caliber is the size of the inside diameter of the firearm. The projectile (bullet) usually has a diameter that is slightly (.001") larger than the inside diameter of the barrel. This is to allow it to stay in contact with the grooves inside the barrel which causes it to spin as it travels down the barrel. The difference between a 12.7mm pistol round and a .50 rifle round is all in the casing (the brass part). A .50 rifle casing is much larger because it needs to contain more powder, in order to propel the bullet further since it is being used in a rifle.

An alternative nomenclature for the .50 BMG is the 12.7x99mm NATO. The .50 AE, which the 12.7mm pistol in game is probably referencing, is also called 12.7x33mm. 99mm and 33mm are the lengths of the cases for the respective rounds.

Because the term "50-cal" is more evocative of the .50 BMG than "12.7mm". Blame it all on the venerable WWII-era .50-cal Machine Gun (which is still used in service today... still the best way to fling a lot of .50 BMGs around). Besides, the other two guns in the semi-auto pistol line already use metric bore measurements.

The BMG stands for Browning Machine Gun :wink_smile:

lol when did Russia join Europe?

...Russia is almost ALWAYS considered part of Europe. Even though the bulk of it is in Asia, the culture, heritage, and majority of population are very much European.
(Not to mention that the distinctions between Asia and Europe are geographically arbitrary and we should probably call the whole thing "Eurasia".)