For what it's worth, during my first couple of campaigns I had no idea what "Pintle-Mounted Gun" meant, even after a brief search through the rulesets. Only after watching Stone Lake's streams I figured out you could put for example various machine guns in there.
This could very easily be clarified in the descriptions of HUMVEE and especially LITTLE BIRD.
HUMVEE description includes: "It can be equipped with a variety of heavy infantry weapons to be used for vehicle combat only." -- This is already pretty clear, but you could make it really explicit with, for example, "It can be equipped with a variety of heavy infantry weapons such as machine guns or rocket launchers to be used for vehicle combat only."
AH-6 Little Bird description is very vague:
"This version can carry up to 4 pintle-mounted weapons." -- As said, this is very difficult to understand, and could be rephrased for example as "This version can carry up to 4 pintle-mounted heavy infantry weapons such as machine guns or rocket launchers."
BTW. Speaking of SL streams, also learned of using Gas Mines as the ultimate underwater meta. That has just been removed. Sounds realistic, though to be fair I have no idea if underwater gas could be made to work or not