Dealing with AEG DMR maintenance for a couple years inspired me to take a step towards HPA. I decided to "buy once cry once" and ordered a build with the following configuration Base Gun Used In Build: G&G KAC SR25 HPA Engine Selection: Polarstar Airsoft F2 Tank Regulator: PolarStar MR Gen 2 Non SLP Tank: Ninja 68/4500 Carbon Fiber Tank HPA Braided Air Line: OD Green Upgrade Tightbore Inner Barrel: Prometheus 6.03 407mm Hopup Upgrade: Maxx CNC Hopup HPA Hopup Bucking Upgrade: Flat Hop Mod Hop up and barrel Installation FCU Battery: HPA FCU LiPo 7.4v 300 mah Lipo Gearbox internals: Ship original internals with build Include Free Battery: Free 7.4 FCU battery I ordered the gun on a Friday with free shipping and received the gun on Wednesday of that next week. So less than a week after ordering I received my custom build. I'm normally more of a "do it yourself" person, but getting this exact setup was significantly cheaper and quicker through airsoft junkies. This was my first time ever using an HPA and with a little guessing this gun was shooting great out of the box. At 1.5J using .30g bbs, I was reaching farther than most others at the field. With proper volume balancing, shimming, and heavier bbs I will most likely get even more range out of this. The midcap that came with this gun did not feed fast enough to consistently keep up with the HPA engine on semi but new mags fixed that issue. The midcap feeding issue is not Airsoft Junkiez' fault, that's just how it came from G&G I believe. All around, Airsoft Junkiez provided a solid build for a competitive price and delivered it much quicker than I expected.