The Rock Island Armory 3.10 Baby Rock magazine is a 9mm replacement magazine listed under manufacturer part number 91018. Its capacity is 10 rounds of 9mm. Retailer listings describe it as a part for replacement feeding, and the item type is classified as a firearm accessory magazine.

The magazine uses a steel body paired with a polymer base plate. Its blued finish is listed as black in appearance. Listings classify it as an accessory magazine in 9mm with a 10-round capacity.

• Brand: Rock Island Armory
• Model: 3.10 Baby Rock
• Caliber: 9mm
• Capacity: 10 Rds
• Material: Steel body, polymer base plate
• Finish: Blued
• Part Number: 91018