With Update 1.29: Road to Badlands, I added the new files to the types.xml files on my community server, no mods, only CFTools, as I do with every update. This includes items such as the new helmets, plate carrier, and the new SCAR with all of its attachments and magazines. The weapon itself spawns normally on the server.
The weapon can be held in the player's hands and placed on the ground with all attachments equipped except for the magazine. However, as soon as a magazine is inserted into the weapon, it can no longer be removed from the player's hands. Any shots fired are also not registered.
After this happens, the weapon remains stuck in the player's hands. Only after relogging is the magazine no longer inside the weapon, and the weapon can then be put away or dropped again.
The same issue also occurs when loading individual rounds directly into the weapon.
The weapon is therefore currently not functional.