Where can one buy a m4a1 metal reciever

Hi looking to buy a metal reciever for a build was hoping to do.have a v2 geaebox but been unable to get a metal reciever from any where for a m4a1

Depends what gearbox you’re putting in but I bought a metal M4 receiver from asiaairsoft.com a few weeks back for $80. They do have a metal gel blaster receiver but I don’t like something about it. It looks a bit drab and boring plus I think it has “nerf” written on the side of it.

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I haven’t had a chance to try it but someone I know has confirmed the Kublai M4a1 gearbox fits the M4 receiver I bought. A tiny bit of modification but it’s up and running well.