All metal except for lower receiver, which is made of that nylon stuff that you find on high end magpuls. Dis assembly is quick and simple. Very fast rate of fire even with a 9.6v nihm. This gun has a High Fps chronoing at around 390-405 fps with .2g bbs. Surprisingly accurate and even better with .25g chronoing at around 370 fps making it perfect for field use. You can even switch between a madbull crawler barrel and a normal tightbore to rapidly switch between cqb and field respectively since this guns dis assembly is so easy and fast.
Only problems with this gun that i had was that the selector switch was loose when i first opened the box. this is easily fixable since all you need to do is tighten a few things. The top rail was also crooked but again, was easily fixable by loosing a few screws. The paint on my selector switch is also wearing out fast. Also does not come with sights.
Red dot sight or scope
Mock suppressor & longer precision focused inner barrel
Small problems aside, i give this 5 out of 5
Built in Sling-mounts
Fast and easy dis assembly
My Selector switch came a little loose (easy fix)
Firing mode symbols wore out quickly
Comes with no sights