Hey Brian, I found some more parts for you to test
http://www.armamentia.com/
Never heard of this company before, but they have some seriously interesting products. Hop about a hopup replacement that swaps the Tanaka hopup unit, rubber and barrel for a VSR10 hopup, rubber, and barrel?
Or a CNC'd reinforced magazine block to stop magazine swell when overpressured (using propane)?
And what about this crazy looking gearset for AEG's?