Mossberg MMR - Manual (Page 18)

18
Lightly lubricate the bolt and cam pin. Insert the bolt into the carrier with the
extractor on the right side as shown (Fig. 48) and reinsert the cam pin.
Fig. 48
Insert the firing pin (Fig. 49), and then pull the bolt subassembly forward until it
stops (Fig. 50).
Fig. 49
Fig. 50
Insert the firing pin retaining pin into its hole on the side of the bolt carrier assembly
until the pin is fully seated (Fig. 51).
Fig. 51
Insert the charging handle into the upper receiver with the groove open upwards
until the tabs on either side of the handle fall into their notches in the upper
receiver (See Fig. 52 on page 19).
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.
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