I would like to suggest adding the AMD-65 to the Security side, preferably to the Advisor class. Since that side doesn't have a weapon fiirng the 7.62X39 cartridge yet, this would be a fitting addition to the firepower of the Security faction in my opinion.
First of all, here is a short description of the weapon:
The AMD-65 is a Hungarian-manufactured licensed variant of the venerable AKM rifle for use by the country's armored infantry and paratrooper units. The main features of the weapon are the side folding wire stock, the front grip, the 12.6-inch barrel which is shorter than a regular AKM barrel and the removable muzzle brake mounted on the end of the barrel.
Now you might be thinking why would a Hungarian weapon end up in the hands of some Middle-Eastern soldiers. The situation is, that the AMD-65 has been exported to the West Bank and Gaza, as well as Afghanistan. An increasing number of western security forces, including contract employees of the former Blackwater Worldwide who are serving in the latter two countries, use highly modified AMD-65s rather than conventional 5.56mm based rifles. The weapon can be easily modified to suit the needs of any soldier who decides to use this weapon.
Let's look at the attachments the weapon can mount:
Sight: The weapon can be modified with the sight mounting bracket seen on the AKMN enabling it to mount any sight or rail system which is using the Russian mounting system.
Here is an example of an AMD-65 with an НСП-3 night sight
Supressor: The AMD-65 can mount the ПБС-1supressor.
Here is a picture from the manual of the AMD-65 with the supressor
Underbarrel launcher: Sure thing. You can remove the foregrip and mount a ГП-25 grenade launcher without any problem.
AMD-65 with an underbarrel grenade launcher
High capacity magazines: The weapon can mount any of the magazines the normal AKM can mount, including the 75 round drum mags from the RPK. You can even easily modify the wire stock that you can fold it while you have the RPK drum in the gun
Here is an AMD-65 from Syria with the RPK drum and some rails + scope mounted
Rail system: You can easily change or modify the metal furniture to mount a rail system to mount anything you desire
AMD-65 with Picatinny rails
Since this weapon is rarely represented in games I think it would be an interesting and exotic sight in the game while it fits the setting of Sandstorm.
By the way, did I mention that even John Rambo himself approved the weapon?