Caliber: 9mm Capacity: 20 rounds Tube: 140mm Stainless Steel Follower: Lockback Spring: 18% Basepad Gen2: Aluminum, prevents over-insertion Backed by the Atlas Magazine Warranty   Compatibility: All Atlas Gunworks Pistols with a tactical or carry magwell All known 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.