El Bridos 5.95 explains his decision to build a rifle piece by piece to create a unique and reliable primary weapon. He shows the key components used, including the external parts like a Geissele MK16 handguard and a Geissele-licensed body, as well as the internal parts such as a Perun MOSFET and a Solink Advent Plus brushless motor. He talks about their philosophy of focusing on reliability and trigger response through "pre-cocking" rather than a high rate of fire, demonstrating the build at the end of the video.