hmm well if you are going to get a King arms Reciever, they usually come with the upper as well, King arms is G&P and Marui compatible from what i know, but with some dremel and filing down certain areas they should fit. not a fan of G&G you should be better off getting a G&G lower, or else change the upper to King arms as well
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Current Lineup:
VFC HK416 Custom
Custom Bowie Tactical x SAI Glock 17 (TM Base),
Custom SAI BLU Glock Build (Timberwolf Base)
Custom Zev Noveske Shooting Team Glock 34
Project Guns
Custom Zev Dragonfly G17 (Project) (In progress)
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