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
In Call of Duty 4: Modern Warfare, the mission "All Ghillied Up" features the sniper Zakhiev. Players, taking on the role of Captain Price, must stealthily navigate through a war-torn area to assassinate Zakhiev, who is a high-value target. This mission emphasizes stealth and strategy, as players must avoid detection while positioning themselves for the perfect shot. The mission is iconic for its tense atmosphere and the introduction of sniper mechanics.
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.
Intervention Barrett 50 cal. WA2000 M12 EBR
It's called the Intervention.