Recoil buffer

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A recoil buffer is a factory-installed or aftermarket accessory component for firearms placed between operating metal parts which impact one another, such as the slide and the frame of a semi-automatic pistol. Buffers cushion the battering force of repeated impact, reducing wear on parts and lengthening the service life of the firearm. Reduction of recoil discomfort is also claimed to be a benefit of recoil buffers.