Price is shipped, tracked, and feed. I spray painted the unit black. These are my custom 3D printed adapter units for airsoft shotguns. These have been used with springers and gas/hpa setups alike. I have sold many at local fields, and a few on here recently. This is a plug and play unit. All you need is this, a shotgun, and an m4 magazine to be a tri-shot hose. I will send you the adapter, a spring, a metal spacer for the spring, and a 3D printed mag release system. I have had only one customer break something, and it was the mag release (he cross threaded it). At the moment, I only have one available (but I will be able to make more once the replacement parts for my printer come in from China).