The AK74M is the main battle rifle for the Russian forces in Battlefield 3, and is the starting rifle for the Russian Assault/Medic class. The Ak74M is only available to the Assault class in Battlefield 3. What the rifle lacks in rate of fire, it makes up for in damage dealt across all distances.
The mod/skin replaces your old/default SMG model.
Before you start downloading OpenSpades mods, please download this version of OpenSpades (0.0.11). Copy the weapon folders to "OpenSpades-0.0.11-Windows\Resources\pngsight-5.pak\Models\Weapons". Copy any sights to "OpenSpades-0.0.11-Windows\Resources\pngsight-5.pak\Gfx".
If you want to use these OpenSpades mods on the normal voxlap Ace of Spades client, locate the "Weapon.kv6" file and rename it to either "semi.kv6", "smg.kv6", or "shotgun.kv6" depending on what kind of weapon it is.