Chamber-ring delayed blowback
From Wikipedia, the free encyclopedia
Chamber-ring delayed blowback is a method for slowing the opening of blowback operated autoloading firearms whereby a raised ring at the rear of the chamber restricts the rearward movement of the slide. This delay system is a very simple solution to the problem of getting small firearm mechanisms to operate reliably.
When a cartridge is fired, the case expands to seal the sides of the chamber. This seal prevents high-pressure gas from escaping into the action of the gun. Because the chamber is slightly oversized, an unfired cartridge will enter the chamber freely. In a chamber-ring delayed blowback firearm, the chamber is conventional in every respect except for a raised portion at the rear of smaller diameter than the front of the chamber. When the case expands in the front of the chamber and pushes rearward on the slide, it is slowed by this raised portion which constricts the expanded portion of the case as the case is extracted. The Seecamp pistol uses this type of mechanism.
Chamber-ring delay is one of five functional delay mechanisms for firearms. The others are:
- roller-delayed blowback, as in the HK G3
- gas-delayed blowback, as in the HK P7
- lever-delayed blowback, as in the FAMAS
- Hesitation-Locked Blowback as in the Remington 51 pistol
