Butt is mounted by massive bolt inside.
Stella 520
Technical Specifications
Overall Lenght 1 000 mm
Manufacturer Kotek Krnsko
Barrel Lenght 415 mm Type piston with break barrel
Sight Radius 490 mm Manufactured Pieces not available
Weight 2,1 kg Production Period 193x-195x
Caliber 4,5 mm

Rear Sight Side View
Rear Sight Top View
Front Sight
Trigger and Trigger Guard

Another type of airgun Stella, in accordance with markings Made in Bohemia-Germany manufactured during the WW2. There is a latching bar on the right side of the barrel - you have to push it towards the cylinder to break the barrel.