This is the STI 2011 magazine in 126 mm for .40 S&W, held to 10 rounds. STI builds 2011 tubes from 410 stainless for their double-stack 2011 frames, and this length sits flush in a standard 2011 grip instead of hanging a long competition stick.

Ten rounds is the restricted count on this part — use it where a 10-round magazine is what you need in .40 S&W. Confirm the gun is a 2011-pattern double stack, not a single-stack 1911.

One magazine. STI part 700-240012611-00.

• Manufacturer: STI International — 2011 magazine, part 700-240012611-00
• Caliber / capacity: .40 S&W, 10 rounds
• Length: 126 mm 2011 tube
• Tube: 410 stainless (STI 2011 magazine family)