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Yes, as are most AR-15 variants and clones from Eugene Stoner's original design. Gases are vented from the gas block located under the front sight post on the barrel through the gas tube back into the receiver of the rifle, where it meets the gas key that is attached to the bolt carrier. The expanding gases then thrust the separation of the gas key and gas tube, thus cycling the bolt, both ejecting the spent cartridge on rearward travel and loading a new cartridge on forward travel. This is known as auto-loading. Many newer designs are now using Gas-piston operation rather than Gas-tube, as this enables better cycling of action and far less fouling of the receiver from the vented gases inside the action itself.

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