This Glock 17 OEM 17-round magazine comes with a pre-installed Shield Arms +5 magazine extension increasing total capacity to 22 rounds of 9mm ammunition in a sleek black anodized finish.Glock 17 OEM Magazine with Shield Arms +5 ExtensionFits Glock 17/34/19X/45 pistolsAdds 5 rounds to standard 17-round capacity (22 total)Machined from billet 6061 aluminum constructionType 2 anodized black finishIncludes +10% power spring for reliable feedingEasy access floor plate design for maintenance100% lifetime warranty and Spring for Life guaranteePerfect for competitive shooting extended range sessions or tactical applications where increased ammunition capacity is essential without compromising reliability.