Trivia

[Warmer]

Can you identify the guns and optics in the photo?

I'll let know my findings after a few days. I have the (unfair) advantage of knowing a bit more about the image.

 

[Ebola]

K2 and a K3. South Korean army training exercise most likely.

 

[Lexthedestroyer]

K2 and a K3. South Korean army training exercise most likely.

Makes sense. Looks like some sort of AR/Galil hybrid.

 

[redshooter]

K2 and a K3. South Korean army training exercise most likely.

Armed with this and Google I'd have to say you are correct.

 

[Warmer]

Hint: In the "K2 and a K3" answer: one is correct, one not.

 

[Roddy]

The guy in the front looks to be a US Marine with an M249 Para, or whatever they call the short barrelled ones, that has an Eotech holographic sight of some kind.

In the background there looks to be another Marine with an M4A1 that may have a TA31 ACOG but it's kind of blurry.