The Glock® Gen 5 Glock 20 10mm 10-Round Factory Magazine is a genuine Glock OEM magazine featuring a hardened steel insert encased with durable lightweight polymer for superior strength and lasting corrosion resistance. This factory magazine features an injection-molded, high-visibility orange polymer follower and high-quality steel spring for smooth, reliable feeding. Clearly numbered witness holes offer quick round counts at a glance. Compatible with Gen 5 Glock 20 pistols ONLY. Order today!