Browning BT-99 Owners Manual - Page 21

The guide pins on the butt plate run on Teflon® bushings (Figure 18). This ensures long life and smooth action of the GraCoil recoil reduction system. An occasional cleaning and light lubrication of the guide pins will prevent premature wear. A light oil is suitable for lubrication. ADJUSTING THE GRACOIL RECOIL REDUCTION SYSTEM When making adjustments to the GraCoil FIGURE 17 system's compression unit, be aware that the unit should be adjusted to the shooter, not to the shell size or loads being fired. When adjusted properly, the recoil from the shotgun will activate the GraCoil system, effectively reducing the recoil felt by the shooter. The GraCoil recoil reduction system features adjustable compression range from 14-70 lbs. with a 5⁄16" maximum stroke. To adjust the GraCoil system, perform the following: GraCoil System FIGURE 18 BEFORE PERFORMING ANY ADJUSTMENTS, ALWAYS MAKE CERTAIN THERE IS NO SHELL IN THE CHAMBER. 1 Loosen the butt plate by inserting a 3⁄32" Allen wrench into the single hole on the right side of the butt plate and turn the set Lubricate here screw counterclockwise two turns to loosen the screw (Figure 19). 2 Remove the butt plate by pulling it straight out. This exposes the center shaft where adjustments are made (Figure 20). 3 Insert the 3⁄32" Allen wrench into the hole in the center shaft and turn the wrench clockwise (light) to decrease the compression to the lightest setting. Do not force the compression adjustment screw. 4 Reinstall the recoil pad by tightening the two screws with the 3⁄32" Allen wrench. 20