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Hey guys, im here in need of help. I just bought gbbr m4 from WE https://www.anareus.cz/cs/plynove-dlouhe/1601-colt-m4-ras-blowback-open-bolt-WE00070.html this one I also bought some pmags but they wont fit, is this m4 older generation? Also can i make it somehow work? Thanks edit: The gun i...