This is a patriotic remix of the RTT-9 9mm Pistol Carbine. The RTT9 is the next iteration of the King Cobra 9 and is the latest in the long-running Shuty line. It takes the innovations introduced in the KC9 and perfects them. Improvements include: - Superior magnet placement for even better recoil damping - Last-round bolt hold open comes standard in this build - Recoil spring is now placed on the bolt centerline - Improved metal charging handle which also sits on the bolt's centerline At time of writing this is likely the best DIY 9mm PCC available. Parts kits can be ordered at https://www.3ddefense.net Assembly video is at https://rumble.com/v2io41o-rtt-9-assembly-video.html