WA M4 BB Thrower!
 

GBB rifles are unbelievable. The shooting/playing experience is awesome. I don't know what else to say, you really gotta shoot em yourself.

Externals:
ACM MK Mod 18 9inch Rail
Pro Arms CQB outer barrel + 1inch adaptor
RS CAA stock (don't know model)
Systema PTW Carry Handle

Internals:
RA Tech Bolt Stop
RA Tech / WA Bulls Eye hybrid Hop Up

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巴打 nice work haha~

Acog and Aimpoing on the same rail axe...