AR-15 Upper Receiver Vise Block
thingiverse
I redesigned the upper receiver holder after noticing that it flexed inward when tightening the vise. A better design is available at https://www.thingiverse.com/thing:4145773. This holder is designed specifically for an AR-15 upper receiver in a vise, but it won't work if your hand guards extend too far back over the upper or if you have a lower installed.
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