Nearly the same distance, enemy are aware of my position and firing at me, with my G28 or Mk 14 I need 4-5 shots to the chest to kill them (same type of enemy) witm my ACR (with long barrel) I need 1-3 shot to kill them. Thats totally annoying, because the stats say the DMRs have way more damage and penetration than the ACR, but are weaker?. And those DMRs shoot 7.62 and the ACR shoots 5.52 so it should be the other way around, if not more.
I noticed this too... Now I mainly use the HTI, It can kill 3 people with one bullet if they stay behind each otherbut it has a slow rate of fire and reload, + only 5 bullets in the mag.
I have the same issue, is annoying and blow my stealth need hit one enemy 5x to kill him.
thats also a problem with the alert status, you shoot someone with no alert on, anyone anywhere on them its 1 shot the minute an alert starts its like they become the hulk and take multiple shots to the head