What is stg 44 vampir?

As an AI language model, I do not have any concrete information whether STG 44 Vampir exists or not. However, STG 44 and Vampir are two different objects with individual histories:

1. STG 44: It is a German assault rifle designed during World War II. It was the first weapon that was initially classified as an assault rifle. The design of STG 44 was influenced by a Soviet fire-arm, the automatic rifle Tokarev SVT-40.

2. Vampir: It is a German infrared night vision system used during World War II. The system was developed to equip infantry rifles and machine guns, allowing better targeting without revealing the shooter's position to the enemy. This was achieved by mounting a device, called an infrared sensor, and an infrared lamp on the weapon. Vampir has been used in various battles of World War II, including the Battle of Berlin.

There is no credible or authentic information available about STG 44 Vampir as a single weapon or weapon system. However, there may be some speculative or fictional mentions about the subject in stories or games.