You shouldn't start out with a sniper role if you are planning on doing real milsim.
Quoted for Truth up to here. Start out with an AEG, then once you've mastered those skills (Aiming, moving, being stealthy, working as a team, using radios, using camo and terrain) then move on to something a little more difficult like trying to take out enemies by using semi auto, once you get to hear invest in a sniper rifle. As far as the last half of azn1's comment yes there are better rifles, alot better, but if your on an EXTREMELY Stingy budget (Like mine) the UTG MK96 isnt bad. I Skipped the middle man and saved myself some cash by just buying the Warrior 1. Its an ok gun and in the right hands its a good gun but by no means is it anywhere safe for a first time gun, UTG or not. A good starting sniperrifle is the TM VSR-10 which has recieved EXCELLENT reviews from everyone i've talked to who owns one. And its cheap to upgrade. If your deadset on a L96 then Maruzen makes a spring version which will run you at least 350 bucks for something shooting 350 fps, or you can get a Tanaka AICS which will run you around 450 bucks and shoots using gas and can reach up to 550 fps easily.
IIRC Airsoft Arizona games will only allow up to 500 fps, so make sure to check before you buy, because individual rules will varry. Its also important to understand that the sniper role in airsoft is not as glorified as the role played by real life sniper teams. Expect to be sitting in one area giving intel reports and taking maybe 15 shots a game
That is of course depending on the role you want to play.
If you are HARDCORE dead set on being a sniper then take the next best route and buy a CA M14, or a TM M14 or a G3 SG1 and become a DMR, get it upgraded to 400 fps get a good hop up unit in them (or if its the TM M14 dont touch it, just adjust it) then play that way. The difference is that a DMR will stay with a squad more then a sniper will, it will also allow you to use an AEG and retain some of the values of a sniper but with Semi Auto/ Full Auto capability.