With more and more customers working on their AR15s at home my team at Creative Arms LLC. has developed some high quality AR15 Vise blocks. Machined from High Density Polyurethane these vise block will give you years of use. Designed to easily lock in the rifle to the magazine well you will never have to worry about your rifle falling off the vise while working.
On sale for $40 at https://creativearmsllc.com/product/ar15-composite-vise-block/