Yeah, I'd go with Laylax for everything related to the cylinder, and also the trigger mech.
Sounds like you want the TM Precision Chamber, which comes with a nice barrel and bucking, so I guess this could be a good list for you depending on the power/reliability you want out of the system:
Laylax Teflon Cylinder
Laylax Cylinder Head
Laylax Spring Guide
Laylax Zero Trigger (comes with orange piston)
Laylax Spring (your choice of power)
TM Precision Hop-Up Unit (comes with nice barrel/bucking)
Heavy Ammo of your choice
I'd also make your own barrel spacer(s)