This is a Taurus® G3C 9mm Magazine with a 10-Round Capacity.
This Taurus G3c magazine offers factory reliability and a low-profile design for concealed carry. Featuring a steel main tube for durability, this G3c magazine is built to last. A high-strength steel spring and low friction follower deliver consistent feeding of every single round. The extended baseplate provides additional grip space and is slanted to enhance concealment. Ambidextrous side scallops offer greater traction to pull a magazine free from the firearm. The G3c magazine also features dual witness holes, making it easy to check how much ammunition you have remaining.