Maybe new weapon cases or customization for mercs like secondary weapons.
-= Submachine Gun =-
Veresk
PPSH-41
-= Assault Rifle =-
akms (gold ) 
RFB
G36C *
9A-91
AK-12
AN-94
-= Shotgun =-
SPAS-12
Saiga FA *
-= Machine Gun =-
RPK-74 *
Colt IAR *
PKP Pecheneg
-= Sniper Rifle =-
SV-98
TKPD Sniper
AWM-F *
-= Pistol =-
APS
TIS Desert Eagle
Clock 18 *
Enforcer Auto *
(My favorite are those who have star – > *)