“Beta” means that most sounds are from trailers. Obviosly they never intended to be in the game.
“Style” means that some sounds never been in trailers (sniper rifle and m4).
Pistol – many trailers (pm sound from Arma 2)
Pump shotgun – trailers 3 and 4 (applied to combat shotgun as well; saiga and many sniper rifles sound ftom Arma 2)
Uzi – Playboy X traier (think it was pistol sound mistakenly applied to uzi)
Ak47 – trailers 3 and 4 (took directly from trailer 4)
SMG – trailer 3 (GTA SA sound)
M4 and sniper rifle sounds are also taken from Arma 2.