This Royal Marine is using an EOTech holographic sight, without magnification, mounted on either an .338 Lapua Magnum L115A1 (Accuracy International Arctic Warfare) or .50 BMG AW50 rifle.

A Royal Marines marksman takes aim from a Merlin helicopter during counter-piracy operations.

I have often wondered why we do not see photos of snipers with 1x magnification sights. During WWII plenty of snipers used iron sights to good effect. It must surely be easier to use than a scope with magnification when bouncing around in a helicopter and aiming at a moving target.

UPDATE: Added additional information.

[Hat Tip: Пьер де Буа]