The total weight including hardware is 9.5 oz. However, the net weight increase is only 8.7 oz. due to the replacement of the original recoil lug bar and nut. INCLUDED: Hex body spanner wrench for recoil lug nut IS included. All necessary hardware, hex wrenches and complete installation instructions. MOUNT DOES NOT INCLUDE SCOPE & RINGS! FITMENT NOTES: We have made every reasonable effort to ensure that this product will fit the majority of Mosin Nagant rifle variants. However, due to the large number of these firearms produced over many years around the world, it is impossible for us to allow for all manufacturing variation. As with any of our products, it may be returned undamaged for a full refund. The mount can only accommodate so much misalignment. You should measure the center distances as described in the SPECIFICATIONS to ensure that the mount will fit properly. Proper tightening of all hardware should result in no movement of the mount during normal firing recoil. NOTE: Any scope or mount that suffers an impact should not be trusted to be accurate. If you feel your mount has been compromised you can still use your original open iron sights. Design subject to change without prior notice. Caution!Improper installation or use may result in damage to property, severe injury, or loss of life. If for any reason this product does not function properly, discontinue use immediately. Always practice proper SAFETY and ensure an UNLOADED condition before beginning installation.