The package is filled with styrofoam, but coated with cloth.
This holds the gun firmly without losing styrofoam balls all over the room (or over the gun).
The M14 comes with one 68rd magazine and a good manual.
It is both in japanese and english and describes everything about operating the gun with pictures and text, troubleshooting and has an exploded view.
As the gun weighs 3.6 kg when empty, with a battery and optics even more, a sling is highly recommended.
Ergonomics of the old stock are not as good as for example at the M4 RIS, but you can improve that by using an EBR or DMR stock.
The built quality is excellent.
No creaks or wobble, this is also one of the first marui full metal guns.
The stock has metal reinforcements and a matte black sandstone surface, this offers a very good grip and does not wear off as soon as usual Marui M14 stock paint.
Most outer parts are made of aluminum, explaining the missing 0.7 kg compared to the real gun, which by the way makes it impossible to rust.
An exception is the magazine shell as it is completely made of steel.
Batteries should be 8.4V to 9.6V, this is absolutely enough for the unmodified gearbox.
The battery compartment is located in the back of the stock and fits medium 9.6V without modification.
If you need more space, just take out the rear metal parts (hold by 2 screws) and remove some plastic parts that only hold the battery in place.
The charging handle is movable and has the most awesome sound ever heard on an AEG, but the bolt catch needs a small modification to work.
As an alternative, KingArms sells an extended bolt catch so you can just tap it like an M4 bolt catch instead of pulling up the modified Marui bolt catch.