MDT Exterior Forend Weights, .35lbs Each/.70lbs Total, Nitride Finish, Black, Case Hardened 1018 Steel, Fits M-lok, Includes (2) Individual Weights 107320-BLK Balancing your rifle is important when it comes to making consistent shots. It gives you more control over your rifle" and produces predictable recoil making it much easier for you to take accurate and quick follow-up shots. The MDT M-LOK External Forend Weights can be placed strategically to tune the balance point of your rifle.