2009 gearbox design and the blowback design for the Classic Army AEGS are at Spartan Imports. They call the blowback series as "Auto" blowback while the 2009 gearbox design are called the X-Series. Classic Army just recently released 4 variants of the Auto Blowback series while the familiar and popular models have the x-series gearboxes such as the M15A4 (M4), M15A4 Compact Seal, and the M15A4 SOCOM though no new pricing is made available yet . Just choose what you fancy among these.