Evolution Gun Works HD Picatinny Scope Mount CZ 557 Short Action 0 MOA Matte Black Hardcoat. Their lug is cut square and may require minor filing to fit in the recievers with radiused lug cuts. Picatinny cross slots run the full length of the rail which gives the shooter flexibility when mounting scope rings and other accessories. Their one-piece scope mounts are the obvious choice for hunters and tactical shooters alike. This mount is a Picatinny-style base and compatible with Picatinny or Weaver scope rings. They machine these in their shop using one of their machining centers. After machining the mounts are tumbled sand blasted and Type III anodized for long lasting durability. They recommend: 0 MOA -if shooting 0-500 yards 20 MOA -if shooting 500-1000 yards When zeroing your rifle with a 20 MOA mount they recommend zeroing at 200 yards. Installation: They recommend 20 inch lbs of torque and a drip of blue loctite (loctite is available through their website and is sold separately). Specifications for Evolution Gun Works HD Picatinny Scope Mount CZ: Manufacturer: Evolution Gun Works Color: Black Finish: Matte Black Hardcoat Fabric/Material: Solid 7075 T6 Aircraft Grade Aluminum Quantity: 1 Gun Make: CZ Action Length: Short Action Gun Type: Rifle Length: 5.09 in Height: 0.54 in 0.35 in Included Accessories: T15 Bit #6-32 Screws Condition: New Ring Type: Picatinny/Weaver Attachment Type: Picatinny Mount Type: Picatinny Gun Rail: Picatinny Features of Evolution Gun Works HD Picatinny Scope Mount CZ: Available for a wide variety of CZ models & actions (short-action standard-action magnum-action etc.) 0-MOA or 20-MOA cant Matte black Compatible with Picatinny or Weaver scope rings Package Contents: Evolution Gun Works HD Picatinny Scope Mount CZ Evolution Gun Works 80924: HD Picatinny Scope Mount CZ 557 Short Action 0 MOA Matte Black Hardcoat