Unfortinatly no it is not possible in the last mission to get a sniper rifle and the simple reason is that the last mission wasnt made to have sniper rifles
you kill the guy on rock and go up to him and take his sniper
m4ao3
You practice.
No.
get one-shot-kills with a sniper to unlock
M21 ebr
You can get FMJ kills with a sniper by shooting and successfully killing someone through a wall or an other surface.
This particular gun is known as the M21 Ebr sniper rifle. It is also used in multiplayer.
Type in Achievement Hunter Sniper Fi in YouTube a complete video guide will come up and walk you through it.
It's called the Intervention.
Intervention Barrett 50 cal. WA2000 M12 EBR
yes thats why they call it quick scoping