The SU16 series is designed, engineered and crafted to be the perfect everyday Sport Utility rifle. Differing primarily in barrel length and stock configuration, these gas piston operated, semi-auto rifles accept standard AR-15 magazines, with some models that store two spare, proprietary magazines in the stock. The Charlie model offers an under-folding stock for compact storage, however this variant still operates in the folded position with a metal GI magazine or proprietary KELTEC 10 round magazine. Like all the SU16 models, it's chambered for the common 5.56 NATO cartridge, comes equipped with a Picatinny-style rail up top and it's excellent for outdoor activities that require a lightweight, compact rifle. Features: Adaptable, durable, modular Configurable - there are a few SU16 models and configurations to choose from to suit your needs, but all of them feature iron sights and an integrated Picatinny-style rail on top of the receiver to mount your favorite optic Utility - if you know anything about KelTec, you'll know that we like to keep things light and simple, the SU16 is an excellent choice for your go-anywhere 5.56 rifle Reliable - all of the SU16 models are gas-piston operated which keeps fouling to a minimum where the magic happens, thanks to the long travel of the bolt carrier, the SU16 series rifles shoot smooth, flat and reliably