Looking to buy an HPA kit for an A&K/CA m249. Need a drop in engine (Jack, F1, Gen 2 Inferno, F2, etc) with fcu, the proper 249 wire harness, and the hollow grip bolt. I will buy a regular engine as well but at a lower price since I need the 249 components Also looking for a m249 Bullgear hop up if you have one.