Mossberg MMR - Manual (Page 13)

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Fig. 25
Push the bolt subassembly in (Fig. 26) and twist the cam pin a quarter turn and
lift to remove the cam pin on the 5.56 model (Fig. 27). Lift the cam pin to remove
the cam pin on the 7.62 model.
Fig. 26
When reassembling the firearm, 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.
Fig. 27
Pull the bolt subassembly out through the front of the bolt carrier (Fig. 28).
Fig. 28
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