The ejecting crown on the shotgun Winchester Model 1300 Defender and Benelli M3T Super 90 was based on the requirements of the Army of the Czech Republic.
Prototypes have been tested in real conditions. The aim was to develop a crown that will withstand the demanding conditions of combat and will be fully functional. It is made of heat- treated steel, the suface is sandblasted and alkaline oxidized.
The ejecting crown doesn´t fulfill the function of the muzzle brake.