I'm using a Deepfire version 2 piston with titanium coated teeth for this setup. It's a little heavy, but I haven't stripped them yet (broken the piston body on the ver 1's, but never the teeth).
My TM hi-caps will feed about 100 BB's at 41 RPS before the gun starts skipping shots, so that's why I'm aiming for lower. I forgot to try my MAG mid-caps when the gun was built like that so I don't know if they'll feed higher.
The Guarder SP170 spring in this setup was doing 390 FPS with .2's, but I also fear I won't get any higher FPS than that withour going to extreme means. Feel free to PM me with any other questions.
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