Description
The ProMag TAU21 is a replacement or spare magazine designed specifically for the Taurus 709 Slim. It holds 8 rounds of 9mm ammunition, giving you an extra round compared to the factory 7-round magazine that comes with your pistol. The extended baseplate makes a real difference if you've struggled with getting a solid grip on the slim frame, especially if you have larger hands.
Construction is straightforward and proven. The magazine body uses heat-treated steel with a blued finish that resists corrosion. Inside you'll find an injection-molded polymer follower and a chrome silicone wire spring that's been heat-treated for strength. The magazine also includes witness holes drilled into the side so you can do a quick round count at a glance, and the floor plate is removable for easy cleaning and maintenance.
Made in the USA, this magazine comes backed by a lifetime warranty against manufacturer defects. It fits snugly in the 709 Slim's magazine well and ejects cleanly when you press the release. Whether you're building up spare mags for range trips or looking to add a little extra capacity for carry, this is a straightforward option that most 709 Slim owners will find useful.
Key Specifications
- Manufacturer: ProMag
- Manufacturer Part Number: TAU21
- UPC: 708279012747
- Caliber: 9mm Luger
- Capacity: 8 rounds
- Magazine Type: Extended replacement magazine
- Firearm Compatibility: Taurus 709 Slim (PT-709, post-2009)
- Material: Heat-treated steel
- Finish: Blued
- Follower: Injection-molded polymer
- Spring: Chrome silicone wire, heat-treated
- Floor Plate: Removable polymer
- Witness Holes: Factory-drilled
- Country of Origin: USA
- Warranty: Lifetime against manufacturer defects
What’s Included
- ProMag TAU21 8-round magazine
Frequently Asked Questions
Will the ProMag TAU21 magazine work with my Taurus 709 Slim?
Yes, the TAU21 is specifically designed for the Taurus 709 Slim (post-2009 models). It fits the magazine well, locks securely, and ejects smoothly. The extended baseplate extends below the grip to give you more purchase with your hand, which is helpful on the compact frame.
How many rounds does this magazine hold compared to the factory magazine?
The ProMag TAU21 holds 8 rounds, while the standard factory magazine for the 709 Slim holds 7 rounds. That extra round can make a difference at the range or during extended practice sessions.
Is the ProMag TAU21 reliable for self-defense use?
This magazine is built with quality materials and comes with a lifetime warranty, but real-world results vary. Some users report flawless performance, while others have experienced occasional feed or slide lock issues in specific guns. We recommend testing it thoroughly at the range with your particular pistol before relying on it for carry.
Does the grip extension really make a difference with the 709 Slim?
Yes. The 709 Slim is compact, and many users struggle to get their pinky finger properly positioned on the grip. The extended baseplate on the TAU21 provides enough extra length that you can get a fuller grip, improving your control and comfort during shooting.
What's the spring like, and will it need to be replaced?
The magazine uses a chrome silicone wire spring that's been heat-treated for durability. Like any magazine spring, it can wear over thousands of cycles, but these typically last a long time with normal use. The magazine is easy to disassemble for maintenance thanks to the removable floor plate.
Is ProMag a trusted brand for magazines?
ProMag has been making aftermarket magazines for decades and backs their products with a lifetime warranty. They use traditional stamping and welding with heat-treated steel construction. Performance can vary depending on the specific gun and ammunition, but ProMag magazines are generally well-regarded as a budget-friendly option.




Reviews
There are no reviews yet.