My very first m4 is a lancer tactical plastic body and metal gearbox. I personally do not recommend it as it needed opening it right off the bat.
If you are planning to by new vfc g&g valken are good starts. Don't forget to budget for a good charger and other side stuff you want on it.
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TM Hi-Capa 5.1 black
TM MP5 First gen
VFC M4 MK18 Mark 1 Stock
DD M4 12.5" with Titan, work in Progress
TM KSG Shotgun
TM AA-12 Shotgun
A Girlfriend for my girlfriend