Patriot Ordnance Factory is showing off the E-Squared Extraction technology for their Gen-4 Rifles in about the coolest means possible for displaying extraction. The concept is fairly simple with four channels integrated into the neck of the chamber. When the round is fired super heated gas passes through these channels pushing the cartridge case away from the chamber walls alleviating any resistance to the extractor for removal. Thus, increasing the likelihood of your extractor living a much longer life. The concept is great and the video gives you an all around vantage point on how it works.