Upper Receiver Vise Block

thingiverse

This is an upper receiver vise block designed for AR15 use. The bottom square allows you to secure it in a vise for precise torque on a barrel or handguard. Vertical holes are built into the vise block, intended for 3/8 inch shafts to provide support during torquing operations. However, I opted to install 3/8 bolts instead, which I firmly believe would have damaged the upper receiver before this design failed. Recessed/threaded horizontal holes enable you to tighten the vise as needed without damaging the block itself. 1/4 inch by 1 inch (20 TPI) bolts fit perfectly within these recesses. The 3/8 bolts currently in place are only 2.5 inches long, which explains their relatively short appearance. I utilized NylonX for this project, but it's likely that PETG or ABS would provide sufficient strength with the bolts installed. TL;DR: A robust AR upper receiver vise block is now available. To assemble the vise block effectively: 1. Insert 3/8 inch by 3 inch bolts into the vertical holes (bolts should have heads facing downwards). 2. Install 1/4 inch by 1 inch (20 TPI) bolts into horizontal recesses. 3. Note that you may need to clean up the 1/4 x 20TPI holes with a tap or screw before threading them all the way in. The photos were taken while wearing slippers.