Grenade count shows total count including smoke grenades which gives you a wrong impression of how many grenades you have IF you are carrying more than just HE grenades. (Give us a separate ammo count for each round type.)
Smoke rounds land much further away than HE grenades when zeroed at and shot at a certain distance -- Zero at 300, round goes much further than 300m.
Hud reticle and ironsight very tricky and unintuitive to use at odd ranges, for example 350m, you have to rapidly switch between 300 and 400 to figure out the approximate middle between the two, there's no simple way to eyeball where the round will land. -- Add odd ranges to the zeroing or implement a different ironsight aiming reticle such as a leaf sight that doesn't have to be zeroed.