ScarL RD cant do damage?

KK I recently brought my ScarL RD back and it seems like the worst gun ever.... My record is so bad that I did better when I use a galil scope.... -_- After a couple experiments, I found out that Even if I hit some1 on the head, the damage is only 30... (When they are moving and blood come out of their head ) I did this a couple times in Egypt, and this is really annoying... I use an m4, and it always headshot when i hit head... can someone tell me why this is happening, I used to use ScarL RD like a year ago and its boss...... Now it has super nerfed damage (When the person is moving, It takes around 3-4 shots to head to actually get a headshot when all times blood came out from head) When the person is still, its 1 hit, but thats uesless.... Someone please help? this only happens to ScarL RD, and not ScarL or any other guns...I even get more headshots with a m16@! What is going on? o.OOOOO

btw This is not a ping problem my ping is around 60, so it shouldn't lag too much.

someone help because I need to make a decision to use ScarL RD or M4, and it seems that ScarL RD has worse stats than a m16...

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