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Aero Precision has created the AR-15 Carbine Buffer Kit to combat the effects of overgassing on short, pistol-length AR-style firearms. By including buffer kits with different weights, the user can fine-tune their operating system to reduce recoil and prevent increased wear on internal components. The buffer kits include a mil-spec buffer tube machined from 7075-T6 aluminum, as well as a buffer spring, end plate, and castle-lock nut. The difference between the kits is in the weight of the included buffer; users can choose from a standard buffer spring, a Heavy buffer, an H2 buffer, or a heavy H3 buffer, with weights of 3 oz, 4 oz, 4.6 oz, or 5.6 oz, respectively. All kits feature slots for a six-position buttstock.