A favorite of the SAS and other counter terrorist organizations, the all new H&K MP5A4 Competition AEG from Umarex features a full metal gearbox and is compatible with Tokyo Marui internal parts. The hop up is fully adjustable and can be easily accessed by pulling the bolt back. This AEG can be also be realistically taken down by simply removing 2 body pins. The all polymer build (body) allows for a very light weight on this AEG. It is very easy to handle and fun to use.NOTE: this gun will only work with Elite Force MP5 Magazines.