native cs_set_weapon_burst(index, burstmode = 1);
Weapon entity index
If nonzero the weapon will be put into burstmode,
otherwise the burst mode will be removed
Sets the weapon's burst mode.
Only the Glock and Famas can be set to burst fire mode as they are the
only guns in the game that provide such a mode.
This native does not verify that the provided entity is a weapon
entity. It will result in undefined behavior if used on non-weapon
1 if burst mode set successfully, 0 if entity is not
an applicable weapon
If an invalid entity index or a client index is
provided, an error will be thrown.