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Add more valuable rail space to your AR or M4 flat-top platform with Hartman'sThree Picatinny Rail Hand Guard System. Made out of a durable polymer, it offers two 2" (5cm) side Picatinny rails and a 4.5" (11.5cm) lower rail for accessories such as lights, handles, and IR illuminators. Each rail is removable to reduce weight when not in use and to minimize bulk. This hand guard system can be installed without having to go to a gunsmith by attaching on your existing upper rail, and offers an option for an aluminum upper rail so you don't lose any space. Included with this system is a quick-release sling swivel so you don't have to sacrifice the convenience of a shoulder sling.