Fully licensed by FN Herstal. Support licensed products. Your support directly benefits the original designer Heavy duty design yet extremely lightweight for mobility and longevity in combat! Fiber-reinforced nylon polymer receiver, handguard, top cover, stock and bipod) Compatible with most A&K and A&K clone metal M249 series components Version 2 Metal gearbox with tricked out internals (specs below) Quick change spring, lipoly ready internals, and Marui M4 system compatible for easy tune-up, repair, and upgrade Aluminum alloy barrel assembly with metal locking mechanism Rotary dial hopup provides precise adjustment Utilizes all M4 / M16 AEG type magazines and can be equipped with various drum mags available from A&K!