On the website if you go to grease gun and watch the video you see it in use during 5 o sink. but you dont during the game... so then the only mission that you get a grease gun is lost and the rabbit hole because i love that gun

i ment iin the mission writen in stone

I meant the mission written in stone

I just got the game thursday but im already past those missions. you might have seen the gun, if the person playing picked it up off a dead american.(i dont know if u can do that though. he also could have had a MP40(german gun) and you might have thought, it was a grease gun. it looks like it because during lost, or whatever, i had both and was using the MP40 when i thought it was a grease gun.

grease gun is my second favourite gun the num.1 is
Garand

I would also want to know where the hell you can find the greasegun in couple first missions!!(Or can yo?)

In the video on the website they could have been playing the game on PC and entered a cheat code to get it.