Not to be confused, the MAC 10 sports a plastic body on the final product. There has been a small error in the previous news update stating the gun is full-metal which is incorrect.
The body of the gun uses the same ‘blast finished’ coating which is found on the Tokyo Marui’s new series of GBB Pistols and AEP SMGs. The silencer included in the gun has a slight rubber coating for the smooth feel. 
The gun is set at a 45 degree angle in the box to accommodate the silencer, magazine, charger, battery, and other small parts. Roughly the MAC10 as stated from PDI’s homepage "it is about the size as a WA MINI UZI."
The gun’s hop up is a dial type system which is accessible from the gun’s ejection port by simply pulling down on the bolt. This picture shows the MAC10 upper receiver removed to show the hop up dial which located behind the barrel. What has been done differently is the inner barrel is a short barrel that cannot be visible from the muzzle and has a nickel plate coating instead of the usual brass colored barrel. This is to ensure the realism in Tokyo Marui’s new SMG. The bolt is also designed to lock when turned in a 90 degree action to prevent the ejection port from opening.
Also in news and pictures from Chameleon Japan, (Chameleon Japan) and Military Blog (Military Blog)
Pictured above is Chameleon’s own custom LIBRA Weapon Pouch. It is like wrap-around holster that uses a fine velcro layer that does not sound loud when you rip the velcro off. It is designed to hold any SMGs and pistols and is strapped on to your Molle vest or web belt. Product information can be found here: Libra Weapon Pouch
Comparison between the Tokyo Marui MP7A1 with the Tokyo Marui MAC10 side by side. Not noticeably large, however the MAC 10 does have just as much to offer as the MP7A1.
This is a video made by Chameleon as he shows over the features of the gun. Disclaimer: Video is in Japanese! Nihongo wakarimasen!
Also to add, PDI JAPAN X-FIRE has listed a performance chart comparing the stock inner barrel vs. PDI’s 01 barrel. Currently the MP7A1 barrel is used to test, however later they will test with a longer inner barrel designed with the suppressor.
Velocity Test
Mac10 (normal) / 0.2gBB（Marui）/ Indoor
Average 250.95 ft/sec 、76.51 m/sec、0.59J
Mac10 (01 inner barrel/135mm STD size)/ 0.2gBB（Marui）/ Indoor
Average 259.65 ft/sec 、79.16 m/sec、0.63J
Mac10 (01 inner barrel/242mm Long size)/ 0.2gBB（Marui）/ Indoor
Average 268.40 ft/sec 、81.83 m/sec、0.67J
Much thanks to Chameleon, PDI , and Military Blog.
