The Glock PCC vise block is designed to seat into the mag well of you Glock Magazine PCC or Glock pistol. This is an essential tool to work on or clean your Glock PCC rifle or Glock pistol. The Glock PCC vise block is designed to work with any vise and fits all Glock 9/40 magazine rifles and pistols. In most cases, the gun will seat onto the block after activating the mag release. Some forged lowers do not lock however the vise block functions the same.