I needed to install an AR-15 barrel on a new upper and didn’t want to pay $25 for a vise block. Instead I used some scrap 2x4s and a few screws to make my own.
Construction
This took about 20 minutes of measuring marking cutting and screwing to get just right. It’s a little bulky and could have been cut down, but ended up being far cheaper than one I would have had to buy!

Place the upper receiver on one piece of 2×4, stand up another one next to it, scribe the height with a third piece so you know how tall to cut the sides

Cut the two side pieces at the same height, clamp the first one down to the base, pre-drill and screw it in

For the second side block, I cut about 1/4″ off the side so it fits snugly over the ejection port cover

Place the top on and screw it down with the receiver inside. I had about 1/16″ of room on the top and placed a shop towel in the hold it firmly
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