MDT Interior Forend Weights mount inside the ACC Chassis forend’s channel, adding up to 2.6 lb across a full set (5 weights on Premier GEN1/Elite, 4 max on Premier GEN2). They install without removing the barreled action, just pull the forend cap, slide the weight into place, and screw it in from underneath, with 3 sets of mounting holes at 3/4″ increments to tune the rifle’s balance point, and clearance slots that keep M-LOK accessory mounting open even with weights installed.