Here are the factory choke tubes for the Saiga Shotguns. These are threaded and designed to attach to the factory threading. They are imported and do not count as a compliance part.

It is recommended to use the open choke or just a thread protector for slugs.

Choke tubes are marked as follows:

Saiga-410: Full - 1.0 (#3), Modified - 0.5 (#1)

Saiga-20: Full - 0.9, Modified - 0.5

Saiga-12: Full - 1.0, Modified - 0.5, Open - 0.0