SRX 306: Built off of the VR16 chassis, the Spartan SRX 306 boasts a metal body, flip-up sights, outer barrel, and rail system. The front sight can double as a pistol sight when flipped down. 395 fps with .2g BBs, lipo-ready, ambidextrous sling-mount plate, 8mm reinforced V2 gearbox, ratio steel self-shimming gears, and rear-wired for battery placement in the QRS stock. The rate of fire varies with different batteries: 8.4V @ 15 BPS; 9.6V @ 17 BPS; 11.1V @ 20 BPS. The QRS stock comes with quick-change tabs, making battery changes fast and easy. *All three of the SRX models from Spartan Imports come with Spartan’s new logo and the 300 Blackout name, along with VFC’s new, robust VR16 gearbox. This gearbox includes a gen II hop-up chamber, high speed gears, robust tappet plate, reinforced piston, and heat-resistant switch mount. These gearboxes were made with high-performance in mind.