Quick view Rosco Manufacturing Rosco Manufacturing K9-1395-HY-THEDON-556 K9 5.56 NATO 13.95" Nitride Stainless Steel Barrel $191.76 $184.50 The K9 13.95" features a mid-length gas system with an optimized gas port to run reliably suppressed and/or unsuppressed. The K9 continuous taper is the most effective profile to dissipate heat from hard use. With weight shifted to the back of the... Compare Add to Cart