Butt is mounted by massive bolt inside.
Slavia 617
Technical Specifications
Overall Lenght 910 mm
Manufacturer Ceska zbrojovka Uhersky Brod
Barrel Lenght 360 mm Type piston with break barrel
Sight Radius 327 mm Manufactured Pieces ?
Weight 1,55 kg Production Period ?
Caliber 4,5 mm

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

Identical with Slavia 618.