I guess the best sniping tips would be...
-find a suitable position that is either a commonly used long straightaway or a big open field. The straightaways, such as bridges, etc., are great because you don't have to lead the enemy. As long as you are far enough away and you are using a high or 12X scope, you will see them long before they see you. I sniped a good 10-20 people wearing a ghillie suit in a blackwoods respawn. I was laying down in a train cart sniping the bridge while enemies ran all around me fighting the seals and I just took my time. Big open fields are great because you have a large area to use and you can calm down and prepare for the shot.
-get the ghillie suits! when you use them appropriately, enemies will walk right over you. Plus, ghillie suits can be used not only for sniping, but also for camping, and just good camoflauge. WARNING: you have to be ready to run light, because the ghillie suit takes up 1 equipment space and adds a good bit of weight to you.
-like others said, assault rifles are awesome! I highly recommend the m14 (bipod/scope) or the M16 (scope/?) since both are very accurate and can be used to defend yourself easily. Also, they are both good counter-sniper weapons, since you can either be accurate, or overwhelming with your gun.
-know where your friends are! If you have a few other snipers on your team, you can dominate the map. On Storm Front, I was sniping along with many of the seals on my team. We dominated the terrorists because we would snipe them long before they reached us. It was mainly due to their stupidity though, because they kept running out in the open.
-To be honest, I'm not a fan of quick sniping. I believe it takes away from the feeling of being a true sniper. I suggest that you just become experienced enough that you can hit someone while being fired at or not. Quick snipe if you want, but its uneeded effort in my opinion. Since most of the guns are inaccurate on full auto at range, just take your time and get the shot. The one thing these people have up on you is fire rate, so make it count. If they clip you once or twice, they are still dead aren't they? Also, being good sniping with a bobbing scope was good advice as well, but if you wait a second or two, your scope stops moving even when crouching or standing.
-Always pick a scope lol. Snipers have the widest shot margin of any gun out of scope, so I recommend scopes.
