The Presma AK-47 Magazine Vise Block is a bench and armorer tool, not an optic. It inserts like a magazine into an AK-47 magazine well so the receiver can be clamped in a bench vise for cleaning, repair, or assembly. The solvent-resistant polymer body protects the receiver while holding it steady. Features: Bench/armorer vise block for AK-pattern receivers Inserts like a magazine into the AK-47 mag well Lets the receiver be clamped in a bench vise Solvent-resistant polymer that protects the receiver Approximately 8 oz Pegboard hang hole Fits AK-pattern magazine wells. This is a workbench tool for cleaning, repair, and assembly.