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Nathan · February 28, 2013, 08:34 PM

Timing is the movement of the action relative to the movement of the bullet or cartridge.

Semis rely heavily on the mag getting the cartridge against the feed lips before the slide hits the case base. Also, the slide has to push the cartridge in a controlled feed. Smacking it from mag to chamber will case a percentage of misfeeds and extractor tension issues. Angles and surfaces must be smooth enough to allow this to happen without burning off all slide energy before lock, but slow enough to maintain the controlled feed sequence. This balance must be within acceptable levels for all rounds in the mag.

February 28, 2013, 08:34 PM	#2
Nathan Senior Member Join Date: July 1, 2001 Posts: 6,333	Timing is the movement of the action relative to the movement of the bullet or cartridge. Semis rely heavily on the mag getting the cartridge against the feed lips before the slide hits the case base. Also, the slide has to push the cartridge in a controlled feed. Smacking it from mag to chamber will case a percentage of misfeeds and extractor tension issues. Angles and surfaces must be smooth enough to allow this to happen without burning off all slide energy before lock, but slow enough to maintain the controlled feed sequence. This balance must be within acceptable levels for all rounds in the mag.