Originally Posted by
Hawkmoon
If you have a 3-point jam, the bullet is pressing upwards on the top of the chamber, causing the barrel hood to be pushed up against the underside if the slide. If this occurs before the barrel lugs are aligned with the slide grooves, as the slide tries to continue forward friction keeps the barrel moving, and the link keeps trying to push the barrel up into lug engagement. If the lugs aren't aligned, the barrel can't go any higher than contact, so everything stops.
A three point jam will always happen before the upper lugs are aligned, as the alignment does not occur until the round is chambered and the breech face, and hood or barrel blocks make contact and provide the alignment of the upper lugs, and closes to battery. A three point jams occurs as it is stripped, nose bounces up to the top inside of the chamber (1) and the case is wedging against the barrel break over corner(2) to chamber, so it is stuck with the case head being pushed by the (3)breech face, the bullet nose against the top of the chamber and the underside of the case wedging against this sharp corner of the barrel chamber ramp. It require a slight radius, which will provide the room needed for the cartridge to slide up the breech face, under the extractor hook, and fully enter the chamber. Only then will the barrel be in a position to go forward, and rise up engaging the upper lugs and close to battery.
CAW
“If it ain't broke, don't fix it' is the slogan of the complacent, the arrogant or the scared. It's an excuse for inaction, a call to non-arms.” Colin Powell
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