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The SMG 08/18 and Maxim SMG are the unofficial names for an experimental German submachine gun based on the MG 08/18 (the upgraded air-cooled version of MG 08/15). The gun is fed from a multi-column en-bloc clip which held 8 column of 10 9mm Parabellum cartridges. The clip is inserted into the left side of the feeding box and pulled upwards into the chamber by a rack mechanism within the gun. When a column is emptied, the clip is pulled to the right, putting the second column in position. When all rounds are fired, the empty clip is pushed out through a slot on the right side of the feed box. 
— In-game description
The SMG 08/18 is a weapon introduced in the Battlefield 1: In the Name of the Tsar expansion for the Assault kit. It features an 80 round box magazine with a rate of fire of 770 RPM. The gun will overheat after firing around 30 consecutive rounds.
There are two variants of the SMG 08/18: Factory and Optical.
The SMG 08/18 Factory is the standard version of the weapon.
The SMG 08/18 Optical is equipped with a lens sight, offering improved aimed accuracy.
- The SMG 08/18 is one of only three weapons not used by the Support class that can have AA Sights equipped in lieu of the standard iron sights, the other being the Medic's Howell Automatic and Fedorov-Degtyarev rifles.
- The SMG 08/18 received an increase in fire rate from 450 RPM to 770 RPM with the release of the Battlefield 1 February Patch, along with Battlefield 1: Apocalypse, representing a 70% increase in RPM.