This year i've probably spent about 800$ upgrading this bad boy. I've done the exterior and internal mods myself. Nothing stock is left over besides the trigger assembly and grip.
Internals
Systema hellical gear set
Systema m120S (430fps) i also have lower rated springs for fields
Systema magnum motor
Systema bore up cylinder set
Guarder Spring Guide
Mad bull tight bore barrel
External
The actual M4 itself is Powder Coated, the the markings are gone and also the rough paint is almost indistructable.
Madd bull XM203 grenade launcher
Prime crane stock with cutomized 10.6v 3600mah battery. Stock is able to move all 4 POSITIONS!!!!!!!!!
hurricane 552 sights
OD paint scheme since im usually in Cadpat
Shaved off my front iron sites and mounted flip up sites, also rear sites are flip up as well
bash meat flash hider
G&P ready mag system
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june 26th, UPDATE
got a bit of cash so i went and got this. Unfortunaly nothing is never easy with airsoft, i had to do some quick mods.

I probably spent enough to buy a Systema PTW but it took me about 2 years to gather up all this.
Give me what you guys think