There is a screw in the front of the original mount that is located underneath the handguard. The handguard must be removed and then this screw must also be removed before the original mount can be removed. Removing the original mount may be a difficult task. Please use caution when removing the original mount and when installing EGW mount. EGW always recommends having their products installed by a competent and qualified gunsmith. Metric screws are only available with hex heads. EGW recommends measuring the hole spacing in your receiver to confirm it matches with the dimensions they have published. Picatinny cross slots run the full length of the rail, which gives the shooter flexibility when mounting scope rings and other accessories. EGW 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. EGW machines 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. Recommend: 20 MOA - if shooting 500-1000 yards When zeroing your rifle with a 20 MOA mount, EGW recommends zeroing at 200 yards. Installation: EGW recommends 20 inch lbs of torque and a drip of blue loctite (loctite is sold separately). The entire mount and accessories (from the mounting screws and wrench down to the packaging) are made in the USA.