Cash/paypal only. For sale today is a custom M4 put together with a rare lower and upper receiver. Externally it has over $500 worth into it, consisting of: -Madbull JP lower receiver (these have been discontinued for some time now) -Madbull Noveske MUR upper receiver (also discontinued, receivers totaled around 200 together) -Madbull MK18 RIS II -PTS EPM stock and EPG-C pistol grip -Acetech Predator tracer unit, the cool one with the TMed KAC QD suppressor. Internally it is a VFC Avalon gearbox with (IIRC) an m115 spring. Will get it chronoed before shipment. Regardless, it is the avalon gearbox so changing out springs is pretty easy. It also has a prowin hopup chamber and Prometheus 6.03mm inner barrel installed. The gun shoots well. Downsides to the gun are that while it has only been used a few times, there are a fair amount of scratches, particularly on the receiver. It is also missing a couple small pieces to finish off the body, like fake pins and the right hand side selector cover. Also the selector doesn't really click into place. Otherwise the gun is great and will serve you well. Add 20 for shipping, and more pics can be taken upon request.