This Magazine Well Insert Assembly is designed to work exclusively with the RugerĀ® PC Carbine?. It accepts all Ruger American PistolĀ® 9mm magazines (90510, 90514, 90617 and 90618). The flush-fit design is made from rugged, glass-filled polymer material for strength and durability. Quick and easy installation; instructions included with product. The 5/32" hex wrench included with PC Carbine? is required for installation. Made in the USA. Genuine Ruger Factory Accessory.