Ludwig Loewe of Berlin was a pre-WW1 military rifle built, who built the early Peter-Paul Mauser rifles.
In 1896, Ludwig Loewe joined with a cartridge company and became DWM, who built Mauser rifles and pistols until the end of WWII.
With a date in the late 1880's it's likely a barrel from a German Model 1888 rifle.
This was the first German smokeless powder rifle, and was in 7.9mm, often called the 8mm.