Ok guys I recently picked up an A&K SR25 because I figured it would be a good platform to start a DMR build. When I got it from AEX(walk-in store) it was shooting about 400-415fps w/ a javelin .2g BB. I don't care about ROF because I disabled the awful full auto function this gun comes with stock. Here's a list of everything I've done with it so far and what I plan on doing to finish it. Some advise about parts would be helpful. Internal Parts so far: 9.6v 1200 mah battery Dboys bearing spring guide Guarder M150 spring(non PSG-1 type) Bravo Aluminum ported piston head w/ bearings Bravo Double O-ring cylinder head 5KU Air Seal nozzle King Arms 80 degree bucking Masamune 6.01mm TBB (509mm) I have an AMP high torque motor and AEG burst wizard kit that I haven't installed yet. Everything else is stock External Parts so far: Magpul MOE motor grip DE Magpul MBUS front & rear DE Magpul trigger guard DE Magpul AFG DE Harris style bipod A&K suppressor A&K rail panel(x2) Now with this set-up I'm getting 472-475fps w/ .2 it's very consistent but my target FPS is 600 w/ .2 because that will yield me about 400fps with a .43g BB. Here's what I'm looking at getting. Internals: 11.1v lipo battery with a 20c dump Astro zero loss connectors 16 gauge silver plated wire Tunable Ver. 2 trigger Matrix SR25 8mm reinforced gearbox CA super torque up SR25 gear set Matrix Aluminum SR25 piston or G&G nano co-alloy piston for the L85 Systema Ver. 2 metal spring guide w/o bearing Systema 400% PSG-1 spring Reaps hop-up bucking Energy SR25 Stainless cylinder or CA SR25 bore-up kit if I go with a 650mm barrel Externals: Magpul PRS for an AEG DE Magpul RSA 6-24x50mm mildot scope w/ micro red dot on top Dboys Ambidextrous mag catch And that's about everything. Like I said advise on parts and cheapest places to buy them would be helpful. If you guys want to through in some of your own DMR builds I'd like to hear about them.