CZ Rings - Model 527 Short Action Manufacture ID: 420140Burris rings and bases have long been favorites of custom gun makers because of their strength, beauty and fit. It's easy to recognize Burris' leadership role in scope mounting systems when you consider the myriad of innovative designs and manufacturing processes that result in rock-solid performance. Each ring is made from a solid piece of steel with the top and bottom half perfectly mated.- CZ 527 - 1"- Medium- SA Ring Mounts Warranty: Burris warrants every product to be free of defects in materials and workmanship for life, even if you are not the original owner. They will repair or replace any product if examination reveals a defect..