Brian Holt writes about the MadBull Metal M4 Body Kits that are available at Jag Precision... "The MadBull Airsoft M4 body kits will come with the needed parts and their Ultimate 3n1 Hop Up Unit. There will be instructions in the box to make it easy to follow along to create your dream rifle. On a side note most of the bodies will not come with some parts since you will be transferring over from your old rifle. We do offer the spare M4 Charging Handle, Selector Switch, Magazine Release and many other parts if you decided to completely rebuild the rifle."

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