The Kel-Tec SU16B is a semi-automatic rifle that shares many of the features of the SU16 series but is noted for being slightly smaller and lighter than the SU16A model. It is chambered in .223 Remington and 5.56x45mm NATO, making it versatile for various types of ammunition. The SU16B includes a low-profile 16" barrel and is equipped with a black polymer frame that integrates a built-in magazine storage within the stock that can hold proprietary 10-round magazines. This model also features a forend that doubles as a bipod for stable shooting, adjustable iron sights for accurate targeting, and a Picatinny-style rail for mounting optics. The overall weight of the SU16B is 4.5 lbs, making it relatively lightweight and manageable for various shooting activities. It maintains the essential characteristics of durability and reliability expected in the Kel-Tec line​.