Mossberg MMR - Manual (Page 4)

4
GENERAL INFORMATION AND MECHANICAL CHARACTERISTICS
The MMR TM is designed to operate with the ammunition caliber inscribed on the
barrel and as shown below:
5.56mm NATO can also fire .223 Rem rifle cartridges
7.62mm NATO can also fire .308 Win rifle cartridges
When the firearm leaves the factory, its metal parts are protected by a coat of
very adherent oil. This coating, especially inside of the barrel, must be removed
before using the firearm. The oil on the outside surfaces should also be removed
when the packing box has been opened because the oil is very sticky and it easily
retains dust and other solid impurities from the air.
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.
Be sure the cam pin is installed in the bolt carrier assembly. The firearm will
fire without the cam pin and the firearm will explode, causing damage to
your firearm and may result in serious personal injury to the shooter and/
or others nearby.
Check your firearm for proper functioning before loading or firing live
ammunition.
This firearm could chamber a cartridge if dropped or jarred with a loaded
magazine in place and the bolt carrier assembly locked to the rear or in its
forward position.
When firing a large number of cartridges in a short period of time, the barrel
of the firearm will become extremely hot. If this firearm stops firing with
a live cartridge in the chamber of a very hot barrel, remove the magazine
and chambered cartridge immediately and allow the firearm to cool. This
firearm could fire just from the heat of the barrel.
The MMR TM is designed to fire semi-automatically. A single cartridge will fire
each time the trigger is pulled. Finger pressure must be relieved from the trigger
before an additional shot can be fired.
The MMR TM handguards are free float tubes. Standard AR-15 / M16 type
magazines of various capacities will function in the 5.56mm NATO MMR TM . Use
Mossberg factory magazines or aftermarket magazines of the same style in the
7.62mm NATO MMR TM .
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