Curious if that is by design since it appears to be the only infantry weapon that lacks this attachment. Any info would be awesome
Numerous weapons don't have the 2x Reflex sight, including the LC2 Lynx Carbine, the MSW-R LMG, and the AS16 Nighthawk Shotgun. I'm sure it's by design, the same way not all the guns have access to Soft Point or High Velocity Ammo, nor Compensators.
The Orion (VS default LMG) also lost its 2x reflex sight. I think its by design. They want you to buy other weapons
It's the perfect sight for this gun, so of course they had to take it away. It'd be a shame if you didn't have to buy another weapon, like that guy ^ said.