Tapco is now making magazine blocks for the AK, AR and SKS platforms.  The magazine blocks allow a gun owner to work on their rifle, using the block, instead of the rifle, to interface with the vice.  The helps prevent unwanted damage.

The blocks are made of polymer and carry a retail price of $12.99.  Each block has a hole for hanging on a peg board if you have an organized work bench.  If you are like me, it would just go into a box on the floor next to the bench.