Oo didn't notice this before.
Well, since you claim to be so very proficient in our language, surely you spotted the REST OF THE SENTENCE
Lets work through this phrase so everyone can understand.
'Awesome gun' speaks for itself. Or does it? I thought my post was pretty clear... Awesome, an Americanism meaning 'great' or 'fantastic'. To be in 'awe' of 'some' thing.
'It's like an M9 which is the coolest gun ever, +100%'
Now for this part, I must concede i left out a comma. It should read-
'It's like an M9, which is the coolest gun ever, +100%'