Let me first say this is a great gun. It has a really good fps and a high about 14-16 rpm faster than thompson and faster than jg m16 veitnam but equal to JG g36c. This gun also has good range. The sights are removable as well as the stock(the stock is removed by the black tool with semicircles at the end), and the flashhider is also removable. To place the battery it goes in the foregrip to do so you twist it and pull forward wich will reveal the connector. Another thing is the hop up the hop up is under a plate ( where a real guns bullets fly out). The hop up is extremly touchy for me at least this can be a good and bad thing. One thing many people didn't mention is the vents at the bottom of the pistol grip, warning if you get sand or dirt in these vents you are fucked, it will jam your gearbox.
All metal body except grips, Metal mag, be careful to not by wrong mags some m4 mags don't work so far only dboys mags work for me and the one it came with. Thats it a great gun I highly recommend it to ayone who plays in a field or cqb enviornment.
Accurate to 110 feet
Battery lasts pretty long aprox. 4 hours on off on auto
Minor stock wobble( no big deal can be fixed if you but tape into the stock crevase)
Touchy hop good and bad
Hard to get to hop up unit
Picky mag taker
Oher than these minor problems this is a great gun buy it.
Rating: [5 of 5 Stars!]