Just finished putting back together my Classic Army/ASG M4 that exploded on the big PB Delta Day, turns out the stock CYMA gears and the extremely cheap DE piston I threw in there that was part of my parts box didn't like a Solink 28k brushless! Caused some extremely nasty PME and exploded both the spur and the piston - threw in some SHS 13:1s and a random CYMA piston I had laying around and it was shooting at 0.127J, only to realise I didn't hook the fucking tappet-spring back on! Sorted now, and it's shooting lovely at 1.107J on a 0.28g. Bosh