Deep Fire has put together a new innovative hop-up system for M4 AEGs that transforms your standard AEG hop-up system to a similar system used in Systema PTWs. It does not use a traditional bucking or nub instead uses a totally different system including the inner and outer barrels. The added benefits are as follows.
Very high quality components machined aluminum
Incredible consistency both with FPS and with accuracy compared to standard M4 AEG hop-ups
Keeps its setting without slipping unlike the traditional M4 hop-up unit
Different design which makes this system more reliable
The body of the hop-up absorbs shock and transfers it into the upper receiver