Atlas Gunworks 2011 140Mm 21Rd Ss Slidelock Magazine Base Pad Ss 9mm

The Atlas Gunworks 2011 140mm 21-round stainless steel magazine is purpose-built for shooters running high-capacity 9mm double-stack 2011 platforms. After two years of development, Atlas engineered these magazines specifically to solve the feed reliability and lockback issues that plague standard-capacity designs in modular grip setups. If you're running a 2011 in competition, at the range, or for serious practice, this is the magazine that lets you load to capacity without compromise.

The 140mm body features new internal dimensions optimized for smooth, consistent feeding across all double-stack 2011 frames in 9mm, .38 Super, and .38 Super Comp. The redesigned follower and a +18% spring upgrade ensure the magazine both feeds reliably under stress and locks back on the last round—a critical detail many high-capacity magazines get wrong. The stainless steel construction resists corrosion and wear, and the discrete 4mm basepad keeps your grip profile tight while providing a solid platform for manipulation and removal.

Twenty-one rounds of capacity in a 2011 magazine is substantial; the engineering here means those extra rounds don't come at the cost of reliability. Whether you're prepping for a match, stocking your range bag, or building out a competition setup, Atlas Gunworks' focus on dimensional precision and follower quality makes these magazines a legitimate step up from basic alternatives.

Key Features

• 21-round capacity in a 140mm body—maximize loadout without increasing footprint excessively
• New internal geometry designed specifically for reliable feeding in double-stack 2011 frames
• Premium follower and +18% spring for dependable lockback on the last round
• Stainless steel construction for durability and corrosion resistance
• Compatible with all modular grip double-stack 2011s in 9mm, .38 Super, and .38 Super Comp
• Discrete 4mm basepad—minimal grip interference, easy to remove and manipulate

Specifications

Frequently Asked Questions

Will this 21-round magazine work with my 2011 platform?

Yes—these magazines are designed to work with all modular grip double-stack 2011s in 9mm, .38 Super, and .38 Super Comp. Atlas engineered the internal dimensions specifically to ensure reliable feeding across the full range of 2011 grip frames.

What makes this magazine more reliable than standard high-capacity options?

The redesigned internal geometry, premium follower, and +18% spring upgrade work together to ensure both smooth feeding and reliable lockback. Many high-capacity magazines sacrifice lockback or feed consistency; this one doesn't.

Can I use this magazine with .38 Super or .38 Super Comp?

Yes. The magazine is compatible with 9mm, .38 Super, and .38 Super Comp in double-stack 2011 platforms. Always verify proper function in your specific firearm before relying on any magazine in a defensive or critical application.

What's included with the magazine?

You receive the 21-round stainless steel magazine body with the integrated 4mm basepad. No additional components are listed in the product specifications.