I like the looks of the gun so I'm opting to upgrade it. I believe, I could be wrong, that the Scar is basically an M4 in the inside. If I am correct, I think the parts I have listed below may work. These parts are all in Evike's website. I've actually had good luck with those guys. Suggestions are welcome. Is there an airsoft store in Maine? I know Army Barracks has the guns but I don't remember seeing any parts.
1 x Systema Area 1000 Steel Reinforced Piston Head.
1 x Modify 7mm Gearbox Bearing Set.
1 x New Version Mad Bull Airsoft Black Python 6.03mm tight Bore Inner AEG Barrel. (509mm)
1 x Guarder Stanless Steel Ver.2 Cylinder Head for Tokyo Marui Compatible A.E.G.
1 x Matrix Ultra Precision Gun Smith Airsoft AEG Gearbox Shim Set (40 pcs)
1 x Matrix / Element Airsoft AEG Gearbox Grease Set
1 x Guarder High Precision Oil Tampered Nozzle for M16A2 / M4 Series Airsoft AEG
1 x Guarder Super Lucid Chromium Plating Cylinder for MARUI M4A1/SR16 series A.E.G.
1 x Systema Hop Up Bucking / Hop Packing for Airsoft AEG
1 x Guarder Poly carbonate Piston for Tokyo Marui AEG Series