The BB Warrior shares what he thinks about the VFC Avalon SOPMOD M4 after using it for 5 years. The VFC Avalon M4 SOPMOD carbine is an airsoft electric gun featuring a quad rail with pre-installed rail covers, an A2 front sight, and a black polymer grip and adjustable stock. It includes an upgraded MOSFET and ECS gearbox, compatible with 7.4-11.1v LiPo batteries and standard M4 magazines. This AEG fires .20 gram BBs at approximately 390 FPS.