Matt of Evike.com tells us more about the G&P Transformer M4 that allows you to change the frontend with its QD Front Assembly System... "The G&P Transformer system is the next evolution in compact, modular AEGs. Designed with the Airsofter who fills the role of a sniper or gunner, the Transformer system allows Airsofters to easily transport an additional primary weapon without the additional bulk of carrying a full size AEG rifle.

The Transformer system redesigns the front assembly of the traditional M4 AEG. Utilizing the AUG style of hop up, the Transformer AEG easily breaks down into two separate components, separating the receiver from the front assembly. Simply pull the locking tab forward and unscrew. This design not only makes it easy to change front assemblies to different lengths, it also allows Airsofters to carry a PDW size AEG in their bag, for easy deployment in the field."