From BAS readme
class weapons
{
// M4 Sopmod
   class BAS_M4ACOG {count = 20;};  Â
   class BAS_M4MKACOG {count = 20;};
   class BAS_M4MKReflex {count = 20;};  Â
   class BAS_M4REFLEX {count = 20;};
   class BAS_M4REFLEXM203 {count = 20;};
// M4 Sopmod SD
   class BAS_M4ACOGS {count = 20;};
   class BAS_M4REFLEXS {count = 20;};
   class BAS_M4REFLEXSM203 {count = 20;};
// Rifles
   class BAS_M14AIMPOINT   {count = 20;};
   class BAS_M24SWS   {count = 20;};
// SubmachineGuns
   class BAS_MP5SDAIMPOINT   {count = 20;};
// MachineGuns
   class BAS_M249    {count = 20;};
   class BAS_M249SPW    {count = 20;};
   class BAS_M240B    {count = 20;};
// SidArms
   class BAS_Beretta   {count = 50;};
// AT Weapons
   class BAS_AT4Launcher   {count = 20;};
// Gear
   class BAS_Satcom   {count = 20;};
   class BAS_Soflam   {count = 20;};
};
class Magazines
   {
// M4 Mags
   class BAS_M4Mag    {count = 50;};
   class BAS_M4SMag   {count = 50;};
   class BAS_mkshell   {count = 50;};
// Rifle Mags
   class BAS_M14Mag   {count = 50;};
   class BAS_M24Mag   {count = 50;};
// SubmachineGun Mags
   class BAS_MP5SDMag   {count = 50;};
// MachineGun Mags
   class BAS_M249mag   {count = 50;};
   class BAS_M240Mag   {count = 50;};
// Grenades
   class BAS_M433grenade   {count = 50;};
// Sidarm mags
   class BAS_BerettaMag   {count = 50;};
// AT Rockets
   class BAS_AT4Rocket   {count = 50;};
// Laser
   class BAS_Soflam   {count = 50;};
// Extra
   class handgrenade   {count = 50;};
   class flare    {count = 25;};
   class flaregreen   {count = 25;};
   class flarered    {count = 25;};
   class flareyellow   {count = 25;};
   class SmokeShell   {count = 25;};
   class SmokeShellRed   {count = 25;};
   class SmokeShellGreen   {count = 25;};
};
It goes in a text file called description.ext in your mission file