Check this out, a review of the fully licensed PTS Centurion Arms CM4 AEG done by Airsoft GI... "Mike does an overview of the newest production model of the PTS Licensed Centurion Arms CM4! This rifle features the KWA 3.0 Gearbox internally meaning you get a very reliable and robust design.

The gun comes dripping with PTS Furniture! Pre-installed is an EPS, EPG-C, and EPBUIS all out of the box!"