Mossberg 590 - Manual (Page 18)

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2) Carefully remove front sight by turning it counterclockwise. Take precautions to insure you
do not damage the barrel finish.
3) Slide heat shield onto barrel from the muzzle end. The large ring on heat shield must be
positioned towards the rear of barrel.
4) With the heat shield on the barrel, use a small padded “C” clamp or a vise, to close the
forward clamp of the heat shield.
5) Position the appropriate length plastic spacer or optional bushing style spacers between
the forward clamp. Insert the two screws and start the two hex nuts on the screws using a
7/64” hex key wrench and a 5/16” open end or box wrench. DO NOT FULLY TIGHTEN
THE TWO SCREWS YET (Fig. 17).
6) Reassemble barrel to action.
When securing heat shield, the barrel must be attached to shotgun. Barrels with heat
shield secured are not interchangeable without proper refitting of heat shield to firearm
as described in the above procedure.
Make sure takedown screw or magazine cap is secure and the barrel is fully seated before
proceeding to the next step.
7) Position heat shield so that the rear (large ring) butts up against the front of the receiver.
8) Using a 7/64” Allen wrench and a 5/16” open end or box wrench, tighten the clamp screws
to securely hold the heat shield in place. DO NOT OVERTIGHTEN THE SCREWS.
9) Reinstall front sight.
4) Compress the springs into the tubes by pushing the pad flush against the stock. Adjust the
pad until you feel the points of the screws fit into the pre-drilled holes in the stock.
5) While maintaining pressure on the pad, tighten the recoil pad screws securely. Do not
overtighten screws.
6) Check for free movement of the followers by pushing them into the magazine tube with
your finger and allowing them to snap back into position under spring pressure.
heaT shielD
BEFORE PERFORMING ANY DISASSEMBLY OR ASSEMBLY PROCEDURE:
a. Move the safety button fully rearward to the “ON” (SAFE) position and keep
muzzle pointed in a safe direction.
b. Open the action, visually and physically check chamber, elevator and magazine
tube to be certain the firearm is unloaded.
heaT shielD insTallaTion
NOTE: The heat shield can only be installed on 12 ga., plain barrel models. The heat shield
will not fit on barrels with Ghost Ring ® sights.
1) Follow barrel removal procedures as described in this Owner’s Manual.