i have a heavily modified sm1 that farts and i would like some suggestions from my more experienced pump brethren. firstly i would like to list the modifications that are being used on my set up.
violent low pro feedneck
CCM half block hammer
TJD Custom high flow valve
CCM hammer spring
SLPS valve spring
Palmers Fatty Stabilizer
Techt Sniper Bolt
CCM EZ handle mini pump kit, modified to fit SM1 body
Hollowed out Main Guide Rod as a volumizer
Quad railed for maximum stability
PE pops ASA
Autotrigger custom done by CCM for timed perfection
overall, this marker is superb. the pump stroke is silky smooth and the timing is perfect. my one issue is that its farting.
as it is now, at 200psi, this thing shoots 300fps. but it farts. what can i do to get rid of this? do i decrease the tension in the hammer spring? do i up the tension in the valve spring? i don't want to raise the psi to help keep the valve closed as it would make my marker loud, and i would rather not have that.
and video of it farting here