Syöttökeinille

Syöttökeinille, a Finnish term, translates to "feeding ramp" or "feed ramp" in English. It refers to a specific mechanical component found in firearms, particularly in semi-automatic and automatic weapons, designed to guide a cartridge from the magazine into the chamber. The primary function of the syöttökeinille is to ensure reliable feeding of ammunition, minimizing the possibility of malfunctions such as jams or misfeeds.

The syöttökeinille is typically a precisely machined surface or a set of surfaces within the firearm's receiver. As the bolt or slide cycles rearward, it extracts a fresh cartridge from the magazine. The syöttökeinille then intercepts the cartridge, angling it upwards and forward as the bolt or slide moves forward, thus smoothly inserting the cartridge rim under the extractor and pushing the cartridge fully into the chamber. The design and angle of the syöttökeinille are critical for reliable operation with various types of ammunition and under different firing conditions. Wear or damage to the syöttökeinille can lead to significant feeding issues. In some firearm designs, the magazine itself also incorporates features that interact with the syöttökeinille to facilitate this process.