Made this P90 back in 2009 and thought I would share. I have since put several cases through it and fielded it on several 24 hour scenario games (perfect medic setup). It took some tinkering to get the e-grip to function properly in a cut down version, but it runs fine now.
GTA E-grip (older version no WAS)
fully upgraded cyclone (paddles, ratchet, ect)
metal power tube and delrin front bolt.
Freak barrel and WWA freak front.
Picture just after I made it, never hit the field:
After about a year of use and a barrel change:
A little over a year of abuse and with my friends A5: