The Retro-Arms OEM Double Heat Shield Hand Guard is the direct real-deal M4 carbine hand guard. Started in the early 90s as the m4 platform grew. If you are looking for look, feel, weight, and performance; and you also want to burn through 1000+ rounds through your rifle, you're probably going to need this product. Beware of other injected molded parts that heat up with use, the double heat shield design keeps your hands safe, no matter how much you shoot.