Here is a list of upgrades that you can do in no particular order:
Prometheus Tightbore Barrel (Dont get their ASH lineup though)
ARS springuide
ARS Piston head w/ attached sorbo
ARS Cylinder head
Prometheus Hard Piston
Prometheus Soft rubber
Shredder concave spacer
New Spring (prometheus if you want)
Prometheus gears (torque up if you want better trigger response)
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