Mossberg FLEX System Shotguns - Manual (Page 9)

PART N0. 100848 REV. A 9
TO REMOVE BUTTSTOCK / PISTOL GRIP:
Before making any buttstock/pistol grip changes, move the safety button
fully rearward to the “ON” (SAFE) position and visually and physically
check the chamber, elevator, and magazine tube to be certain the shotgun
is unloaded. Also, be sure to keep the action open and the muzzle
pointed in a
safe direction. Refer to your firearm’s owner’s manual for
additional safety and functional information.
a) Push the latch so it is fully extended as shown (Fig. 17).
Fig. 17
b) Turn latch 90 degrees counterclockwise (Fig. 18). The buttstock/pistol
grip will not come off if the latch is not turned in this direction.
Fig. 18