This m249 is stock no upgrades. Rips pretty good with a 9.6 nimh battery. Comes with 1500rd box mag with charger and battery for box mag. Looking to trade for avalon cqb m4 or krytac mkII crb m4 . This gun has only seen action at 2 events will accept m4 mags. Would suggest hi cap m4 mags over midcaps. 2 trigger pulls and a midcap is empty. Have any other questions just message me. Gun runs perfect no feeding issues at all.