I’m pretty sure JVG has assembled some before and I know Mike Centola who is the owner of All Star tactical would have some knowledge in that area.
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Lolz, yeah i do most of his upper work, he just buys all the bits and screws the easy stuff together :lol
But really yeah he does piece his stuff vs buying full uppers. saves some money on basic guns and/or allows you to get better parts(like coated bolts, pins, etc) for the same price.
My next gun, Mc Millan Tac 50.