Yeah man go for the FT piston and valve you will be very pleased I'm sure. Charlie does a real good job on his valves and pistons i have them in a few of my guns and had not a problem and great gains. Mike
Ft pistons I'm pretty sure are strictly for pumpers.. Co2 and hpa guns would use the boss valve, or bulk fill using a stock disco valve..
Well I've been reading and think maybe a disco hammer spring may be a good upgrade to try as well. Any thing else yall can think of?