Quick and Easy DIY AR-15 Upper Receiver Vise Block

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.

In the vise and ready to go


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

The block should fit right here

Sandwich the upper receiver between the two side pieces and screw the second side in like the first

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

Turn is sideways and clamp it in the vise

It should have plenty of strength to torque a barrel nut down and it won’t mar the anodized finish either!


Barrel and barrel nut installed

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