Mossberg 590 - Manual (Page 19)

To change removable combs:
1) Using a 3/16 inch Allen head wrench (supplied) unscrew and remove the comb retaining
screw found at the top center of the removable comb.
2) Place the desired comb into position. Insert the comb retaining screw and snug-tighten.
Do not overtighten as this will damage the internal assembly components.
accu, accu-mag choKe TuBes
BEFORE REMOVING OR INSTALLING ANY CHOKE TUBE:
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.
Do not use bent or deformed choke tubes as these may result in tube or barrel
damage upon firing which may cause serious personal injury. Inspect choke tubes
periodically to insure they are properly installed and in good condition. Pay special
attention to the threaded end of the choke tube to be certain it is not deformed or
dented.
Never fire this firearm without a choke tube properly installed. Failure to do so will
damage the precision threads on the inside of the barrel. Firing this firearm with loose
choke tubes may lead to damage to the choke tube and barrel, as well as serious
personal injury.
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Dual - comB ® Trophy sTocK
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.
500 ® AND 590 ® MODELS 6-SHOT CUT AT 1 5/16” (A)
590 MODELS WITH ACCESSORY LUG CUT AT 1 7/8” (B)
590 MODELS WITHOUT ACCESSORY LUG, USE AS IS.
Whenever the heat shield barrel is removed from the shotgun, repeat the above steps
5-8 to insure that the shield is not preventing the barrel from being seated fully.