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AR 5" Inch Builds

MCS Gearup’s collection of 5 inch AR upper receivers is perfect for AR pistol builds. Shorter builds generally produce heavy cycling and a lot of recoil even in a light-recoiling caliber like 5.56 or .223, so consider upgrading one of these 5 inch AR pistol uppers with a muzzle brake if it’s not already configured with one. Several of these upper assemblies are USA-made from the highest-quality forged components. If you have any questions about upper specs or parts compatibility before buying contact us at We also sell a collection of pistol braces.