Hi, I'm looking to upgrade this fantastic replica known as the HK ARES G36CV. Stock it shoots 400 fps w/.2 BB's. as is consistent at 360 +/- 3 w/.25's. It shoots well stock, 150 ft 9/10 body shots, max range is about 180. Recently I installed a Angel Custom 370mm 6.01 barrel w/ madbull red bucking and h-nub. The weird thing is it has nearly ZERO consistency . Ranging from 370-390 w/.25's. Although I did this in the dark so I have no real idea about its new range or accuracy. So I decided to compile some upgrades and I'm unsure of what to get. Currently I have the Prowin Cnc aluminum hop up chamber, on the purchase list. http://www.airsoftgi.com/product_info.php?products_id=11366 Looking for ideas on the following; cylinder, cylinder head, piston head, air nozzle. My local shop (which will provide the labor) installs madbull full metal teeth pistons (which I like). I'm unsure if I should buy the Systema Energy cylinder set http://www.airsoftgi.com/product_info.php?products_id=6118 Or list 2) http://www.airsoftgi.com/product_info.php?products_id=5726 http://www.airsoftgi.com/product_info.php?products_id=5413 http://www.airsoftgi.com/product_info.php?products_id=5618 Any help is greatly appreciated. I'm limiting my selections to US based retailers. Oh depending on FPS, I'll be running either a M120 or M130(currently in gun). I plan on using an 11.1v lipo, 25C continuous 50 burst. Motor, gears, bushings/bearing, Tappet, and all proprietary parts will remain the same.