The lights are on
This is just a guide to help you in splinter cell conviction.
Good Pistols: any of the pistols with a built in silencer. Trust me I have beat the game the other pistols (desert eagle and USP45) are not meant to be used.
Sub Machine Guns: best are Ak-4u or UMP with a silencer
Assault Rifle: Personal preference (hint: the M4 and SC3000 are almost the same with different power)
Shotgun: Pretty much never good unless you are going around with a un-silenced pistol
Tips: STAY STEALTHY, clear out enimies behind you, save your marks, and if you are losing take a break and then come back.