Mossberg MMR - Manual (Page 7)

7
OPENING THE ACTION
The bolt catch is located on the left side of the receiver above the magazine well
(Fig. 2).
The bolt catch allows the action to be held open for inspection of the chamber
and action or unloading without pulling the trigger. The action may be manually
opened by pulling the charging handle out and pressing on the bottom of the bolt
catch until the action catches and stays open (Fig. 9).
Note: The action will lock open when an empty magazine is installed, and the
action is cycled by pulling the charging handle rearward.
Fig. 9
REMOVING THE MAGAZINE
WARNING
Because this firearm can be used as a single shot, it will fire whether or
not a magazine is in the firearm if a cartridge is chambered.
FIREARM WILL FIRE WITH MAGAZINE OUT.
Removal of the magazine will not unload the firearm! After you remove the
magazine always visually and physically inspect the chamber and receiver
to ensure the firearm is completely unloaded!
This firearm is equipped with a removable magazine. The magazine can be
removed with the action in the open or closed position. Remove the magazine by
pressing on the magazine release button (Fig. 10). Most magazines will fall freely
from their seat.
Familiarize yourself with the firearm by installing and removing
an unloaded magazine and by learning to keep the action in the open position.
Fig. 10
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