Hey everybody! Most of you probably haven't seen many of my posts because I basically only lurk but I've decided to come out of the shadows. I have some experience working inside the gearbox but I still have a LOT to learn. This thread is going to help me learn by providing a journal for my etching adventures so you guys can give me all the constructive criticism I know I'll need to be a better tech. So without further ado let's get down to business I have always wanted to make a DMR and between summer finally arriving and me being in the financial position to afford a DMR I am ready to start! My goals for this build are -Almost instant trigger response -To be able to hit a torso sized target at 275 feet 8/10 times -Having my FPS between 420 and 430 FPS to meet my fields MED Here is my parts list to complete these goals: GB shell: Stock JG v2 gearbox shell. This should be fine since I'm not doing anything extreme here. http://www.evike.com/products/35432 Gears: SHS 13:1 gears. These should give me pretty good trigger response and they can handle the spring I'm wanting to put in. http://www.evike.com/products/32917/ Motor: JG blue long version. not much to say about it. http://www.evike.com/products/29435/ Air nozzle: I'm not sure what air nozzle to use so suggestions are welcome. Piston head: I'm also unsure of what piston head to use. Bearings: I also don't know what bearings i should use. Piston: SHS 15t piston http://www.clandestineairsoft.com/p...ton-with-15-teeth-shs-blue-15-tooth-p-56.html Spring: Prometheus MS120SP spring http://www.brillarmory.com/index.php?main_page=product_info&cPath=44_61&products_id=153 Spring guide: CNC BAAL spring guide http://www.evike.com/products/48150 Cylinder: CNC one piece v2 cylinder and cylinder head http://www.evike.com/products/44024 Tappet Plate: Stock JG v2 tappet plate Selector plate: Stock JG m4 selector plate Trigger mech: One of Zard's mosfets. Everyone suggests them and seeing as I don't think I'm ready to make my own they seem the clear choice. Wiring: 16 gauge wiring should fit in a v2 GB correct? Hop up: Lonex m4 hop up chamber. It's been working fine for me so far so I don't see a reason to replace it. http://www.evike.com/products/35846/ Bucking: I've heard Lonex 70d buckings are pretty nice for DMRs although I am currently using a G&G green. http://www.evike.com/products/43109/ Barrel: I have a polished 509mm stock brass barrel I've been using and if I lap it I'm hoping to get nice results. If not I will go the sure way and buy a Prometheus 509mm 6.03 tight bore. Battery: I know that I'm going to need a 3s lipo but I'm unsure of what C rating and mah I need. Would this one work? http://www.hobbyking.com/hobbyking/...tech_2000mah_3S_15_25C_Lipo_AIRSOFT_Pack.html Mods: Compression, AOE, shimming, wiring to deans, R hop (May pay Zard to do this if I can't do it right) I think that covers just about everything. If you have any suggestions, constructive criticism or I missed something please speak up and correct me. Thanks guys!