Listen to ThunderCactus and CDN_Stalker on this one. They know the sniping game well.
Try a firefly bucking!
As far as barrels go, length can affect your shot. But as to how long versus FPS, rounds, etc has been a very difficult point of contention between airsofters. The most all around stable barrel you can get is the 6.04. If you want to increas your grouping a little, try a 6.03 but go no tighter. After that, you are very realistically only increasing FPS and BB destabilization. Some guns will use a 6.01 well, but I haven't seem many. For a longer range/accuracy, stay between 6.04/6.03.
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