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The Command Arms Tri-Rail Forend for Mossberg 500 and 590 Shotguns is a lightweight, durable accessory mounting solution that is a drop-in replacement for the factory forend. The polymer forearm features 2 removable Mini Side Rails that are ideal attachment points for tactical lights or lasers and a full length bottom rail for the addition of a vertical grip. May require a special wrench for installation (not included). 12 Gauge only.