ARX100 5.56mm/.223 Remington 16 Inch Barrel Ambidextrous Controls Telescoping Folding Stock Black Finish 30 Round. Cold hammer forged barrel can be removed and replaced with various lengths and calibers in a matter of seconds. Case ejection can be switched from right to left with the simple push of a button. All of the critical controls are completely ambidextrous. With a constant contact pistol system the ARX100 can easily feed and fire under the most unforgiving conditions. Lightweight technopolymer receiver allows for reliable operation with virtually no lubricant. No pins and can be completely disassembled with no tools at all. Accepts standard AR magazines. Removeable back up sights. Telescopic folding stock. Full length picatinny rail. Ambidextrous safety selector and magazine release.