Wow, this thread actually exists, took a while to find
I don't see anyone upgrading their M14's to the tits yet so here goes
Classic Army M14
Externals
King Arms CNC RAS
King Arms Bipod Adapter
King Arms Spring Eject Bipod
NC Star 3-9x scope
Internals
Madbull M120 Spring
Modify Gear Set
Modify Quantum Piston
Modify Bearing Spring Guide
Modify Moundless Hop Up Sleeve
Lonex Enhanced Aluminum Cylinder head
Lonex Air Seal Nozzle
Lonex Hop Up Unit
Prometheus Metal Piston Head with Bearings
Prometheus Soft Bridge Tensioner
Prometheus 6.03mm 550mm Tightbore Barrel
SHS Full Cylinder
