A buffer spring, gas piston, ejector spring and buffer, extractor spring, extractor, and op-rod (at 35.9k and 66.9k). Even though this type of reliability is unheard of, we still made improvements based on this feedback.
POF-USA’s patented E2 dual-extraction technology consists of four small channels cut into the walls of the chamber allowing a small amount of gas pressure to push against the neck of the spent case. This pressure assists in extraction by breaking the seal between the chamber and case as well as pushing the spent case to the rear as the extractor is pulling to the rear. This removes a tremendous amount of work that would otherwise be left up to the extractor.
Almost all of our rifles come standard with E2 Extraction Technology.