Gunner, HEAT, PC! offers detailed depictions of gunnery systems for a variety of vehicles and weapons.  Some of these require specific knowledge in order to use them to their full potential.  For convenience, we've assembled a list of all gunnery guides written for the game so far.  

TANKS

M1IP
https://gunnerheatpc.com/news/articles/gunnery-guide-m1ip

M60A3 TTS
https://gunnerheatpc.com/news/articles/gunnery-guide-m60a3-tts

M60A1 RISE (Passive)
https://gunnerheatpc.com/news/articles/gunnery-guide-m60a1-rise-passive

Leopard 1A1A1 through 1A1A4
https://gunnerheatpc.com/news/articles/gunnery-guide-leopard-1a1-series

T-80B
https://gunnerheatpc.com/news/articles/gunnery-guide-t-80b

T-64B
https://gunnerheatpc.com/news/articles/gunnery-guide-t-64b

T-64A
https://gunnerheatpc.com/news/articles/gunnery-guide-t-64a

T-72M1
https://gunnerheatpc.com/news/articles/gunnery-guide-t-72m1

T-55A
https://gunnerheatpc.com/news/articles/gunnery-guide-t-55a

INFANTRY FIGHTING VEHICLES

M2
https://gunnerheatpc.com/news/articles/gunnery-guide-m2

BMP-1
https://gunnerheatpc.com/news/articles/gunnery-guide-bmp-1

Happy hunting!