Kel-tec rdb bullpup 5.56mm 17.3" black/tan grip 20rd FEATURES-Black/Tan grip-17.3" barrel-1:7" twist-1/2x28 threads-Black polymer stock-1913 Mil-Spec Picatinny rail-4 pound trigger pull-Ambidextrous magazine release-Adjustable gas system-Downward ejection port-20 round magazine capacity (or any AR-15 compatible magazine)-27.3" overall length Other Features: Downward ejection bullpup, uses standard ar15 magazines