Auswurfport

Auswurfport is a term used in firearms design to refer to the opening in the receiver, slide, or bolt through which spent cartridge cases are expelled after firing. It is a critical part of the autofeeding cycle, working in concert with the extractor and ejector to remove a spent casing and make room for the next round.

Function and operation

After a round is fired, the extractor pulls the spent case from the chamber. The bolt or slide then moves rearward, and the ejector returns the case with a sharp impact that drives it out through the Auswurfport. The shape, size, and position of the port influence the direction and speed of ejection, the likelihood of jams, and how hot gases and powder residue are directed away from the shooter.

Design variations

Auswurfports are typically located on the side of the receiver or slide and most commonly eject cases to the right in right-handed designs. Some firearms offer ambidextrous or reversible ports, downward or upward ejection options, or multiple ports to accommodate different handling preferences. Many designs also incorporate a dust cover or protective flange to shield the port from debris when the firearm is not in use.

Related components and maintenance

The port works together with the ejector and extractor, and is affected by wear, fouling, and ammunition variability. Regular cleaning of the Auswurfport is important to prevent obstructions, which can cause misfeeds or failure to eject.

Practical considerations

The port’s location and orientation influence shooting comfort for left- or right-handed users and can affect recoil feel and heat management. Knowledge of a firearm’s Auswurfport design helps in diagnosing ejection problems and selecting models suited to user preferences.