USP .45 magazines are all metal while .40 caliber and 9mm magazines are made from a high-strength polymer with a metal insert located in the upper third of the housing.The metal insert increases the strength and durability of the magazine. Cartridges are positioned within the magazine in a staggered arrangement but are fed into the pistol from a single row under the feed lips.The cartridges are visible through the numbered viewing holes located in the back of the magazine. For maintenance and cleaning, all magazine floor plates can be easily removed.

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