The political undertone concerning firearms in this thread is thoroughly entertaining. I reside in the southern United States, which has arguably the most ardent gun culture in the world. It's nearly impossible to go your entire life down here without having at least held a gun.
It's rather unfortunate to see the degree of firearm expertise that was prevalent in previous iterations of MGS become perceivably nonexistent in MGSV, and I would place my bet on licensing issues being the key reason for this.
If I remember correctly, even the military vehicles and helicopters are only vague resemblances of their real counterparts in this game. That implies that nothing in this game is truly historically centered like the previous Metal Gears were.
I'll still enjoy the hell out of MGSV, even if when Solid Snake makes an appearance in the end, they'll have to find some way to replace his Signature SOCOM.