Custom Fraken Troy M4 CQB Short stroked set up that has been running for 4 years straight with no issues whatsoever. the gun doc who set it up for me is one of the old gun docs from UNcompany. the gun shoots at a steady rate of 25 - 28 RPS on 11.1v lipo and has been running on lipo since 2009 with over 100K rounds through it

only thing changed was probably the hop up rubber since it wears down but haven't even opened the gearbox up since it was built