It has a modular construction allowing for easy replacement of components and changing between barrels with different chamberings.

While the 404 has a similar appearance to the 202 on the outside, it has several upgrades and updates, and parts are not necessarily compatible.

This is essentially a 5 mm hex key integrated into the front sling swivel stud, and can be used to disassemble the forend, buttstock, switch barrels or adjust the trigger.

The trigger weight can be adjusted by the user after the forend has been removed using the included Sauer universal tool or a 5 mm hex key.

[4] To disassemble the barrel, the forend must first be removed by unscrewing one screw with either a 5 mm hex key or the Sauer universal tool.