Ah, that's not exclusive to the L96. Last night for instance, running around Ziba Tower with my G53 getting hipfire kills at a respectable range, I encountered a guy standing not five metres away from me, completely in the open. Fired three quarters of a magazine at him, the crosshairs barely bigger than he was on my screen, and I got no hit markers. None! He killed me right good though, naturally. Ended quite a long kill streak that did, I wasn't happy. I used the L96 last night as well and had no such problems, though I couldn't tell you how many kills I got. Not many were headshots, but I didn't see any collisions being undetected.
Oh right, I've just seen your posts on the page before this one. Yeah, I've been having issues with collision detection but I think it's mostly down to lag.
Edit: Just scored a 1002.42m headshot with the JNG-90 on Bandar! My previous best was around 640m I think.