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Dead Foot Arms MCSRFSRCBN1: This is a professional grade retrofit kit that allows you to transform your standard AR-15 into an AR platform rifle with a side folding stock. It utilizes proprietary dual-spring technology to reduce bolt bounce and provide reliable cycling even under sustained fire. This system includes everything you need to shorten the overall length of a typical AR-15 with a 16" barrel to an OAL of 26.5" when the stock is folded. It gives you a built-in folding stock adapter that provides positive retention when the stock is folded. With a quick swing of the buttstock, you will have a rock-solid lock up with the stock in the deployed position. This system includes a modified bolt carrier group, recoil springs, and folding stock adaptor kit. You can use any standard AR-15 receiver extension buffer tube and any standard Mil-Spec or commercial buttstock.