damm good job bro
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Using old mags for a receiver block only works well when a mag catch/button is in the lower. The PSA block is actually very sturdy.Great job. I might add you cannot overstate the importance of a professional quality vice to hold the lower receiver rock solid while installing parts. I use an old Pmag clamped into the vice - it holds more solid than a vice block. Also, the Magpul Castle Nut Wrench makes that job a lot easier, but expensive ($80). The cheap ones can easily mar the nut or buffer tube.