Everything you need for that KILLA HPA build! Includes - PolarStar UGS HPA Stock System (Model: Type 1 / Threaded Buffer Tube Receiver) - (2) 10ci 3000 PSI Ninja HPA systems - G&P Adjustable Stock for Polarstar R3 13ci HPA Tank Systems - REDLINE -SR-M Hurricane Ver-2 M4 was engine -EMG Falkor Receiver (safety need to be replaced) I am willing to part out. IM me for single part prices. You pay shipping