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Medic class, TR, initial gun, T1 Cycler - best Medic gun.
Upgrade it through certifications, not purchased through the store - you cannot buy cert points. A membership of £9 or about $14.99, will grant you a 25% bonus to certificate gains. You can buy boosts, but the membership also gives 500 station cash which can buy you about 10 days worth of exp bonus. However the counter on the boosts continues while logged off, so the bonuses are very small.
The guns are ALL sidegrades, take the infiltrator class, the snipers come in three grades, the close, medium, and long range. The long range snipers are bolt actions or semi autos, which SUCK up close. The close range is the scout rifles which are much more effective at close range but TERRIBLE at long range.
Everything in this game, every gun, every cert comes with an upside and a downside. Buy a 2 shot burst rifle for the medic class? Lose out on your CQC possibilities. Cert it with a supresser? Lose out on long range shots.
If you believe that the game is pay to win you simply haven't played it enough yet, you don't understand it, or you have a bee in your bonnet about free to play in general.
Just a last note, I have free to play, because most stores are cons, most involve some kind of pay to win, Planetside 2 at most could be called a pay to progress faster game.