ABOUT ATLAS GUNWORKS PREMIUM 29 ROUND 9MM MAGAZINE THIS 170MM MAGAZINE FITS STACCATO 2011 & 1911 DOUBLE-STACK HANDGUNS The redesigned, dimensionally correct magazine body improves feeding in all 1911 double stack pistols with the Atlas's 13-coil spring and competition follower kit. These competition magazines work with all modular-grip double stack 1911 pistols. These hi-cap magazines have a capacity of 29 rounds. The 9mm magazine tube also works with .38 Super and .38 Super Comp. ***Note: Must use a 3mm basepad to be IPSC legal.*** 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.