Experience true Glock® reliability with the Glock Gen 5 Glock 21 .45 ACP 10-Round Factory Magazine. An impact-resistant polymer follower helps ensure smooth, reliable feeding in any shooting application. This factory magazine boasts rear-facing witness holes for quick, at-a-glance round counts with full-length steel-lined polymer construction and a tough polymer baseplate for superior strength and long-lasting corrosion-resistance in virtually any environment. Glock’s Generation 5 pistols evolve on perfection to deliver improved functionality and rugged reliability. From their flared magazine wells, re-textured grooveless grips, and corrosion-resistant nDLC finish to the new marksman barrel—this is a whole new kind of Glock.