ABOUT ATLAS GUNWORKS CLASSIC 17 ROUND 9MM MAGAZINE THIS 126MM MAGAZINE FITS STACCATO 2011 & 1911 DOUBLE-STACK HANDGUNS The Atlas Gunworks Classic 1911 Double Stack Magazines are available in 17 and 20-round configurations. We recommend classic magazines to shooters looking for a tough magazine that feeds awesome and locks back reliably in most modular 1911 double stack and Staccato 2011 style pistols. Features: Caliber: 9mm Capacity: 17 rounds Tube: 126mm Stainless Steel Follower: Lockback Spring: + 18% Basepad: Aluminum, prevents over-insertion Backed by the Atlas Magazine Warranty Classic Magazines Compability- All Atlas Gunworks Pistols with a tactical or carry magwell All known Staccato 2011 style and 1911 double stack modular pistols with no magwell or a Staccato Compatible Magwell Staccato*: Staccato C2, Staccato P, Staccato XL, Staccato XC using a Staccato Magwell Springfield: Prodigy 5" 1911 DS, Prodigy 4.24" 1911 DS *Some Staccato Pistols made after August of 2024 have new frame dimensions, which prevent the use of all known aftermarket magazines.