I excelled with M16A3 and the M416 (don't forget the K10) before I was even CLOSE to unlocking the M110K5, I have friends on PSN that are good with the RO993, hell, I even know some people who are good with the M1903 (which is IMO a really weird sniper). So I don't think it's necessarily a "skill issue", I think it comes down with how busted the gun is.