Experience the ultimate in suppressed AR-15 performance with the KGM ISURG 5.56 16 in Integrally Suppressed Upper. This purpose-built upper receiver group delivers exceptional accuracy, sound suppression, and flash reduction while providing a legal one-stamp solution for compact, maneuverable suppressed shooting. Key Features Integrally Suppressed Design: Hardened stainless steel suppressor pinned and welded to an 11.5-inch barrel for a legal 16.7-inch overall length, eliminating the need for an SBR tax stamp. Tuned Gas System: Carbine-length gas system optimized specifically for suppressed use, reducing blowback and ensuring reliable cycling across a wide range of 5.56 NATO ammunition. Complete Out-of-the-Box Solution: Includes full-auto rated BCG, charging handle, and Magpul MBUS 3 backup iron sights for immediate compatibility with any standard AR-15 lower receiver. Premium Construction: Nitride-finished M4-profile barrel with 1:7 twist rate and Black C-Series Cerakote on the suppressor for durability and corrosion resistance. Specifications Caliber: 5.56 NATO / .223 Rem Barrel Length: 16.7 inches overall (11.5 inches rifled) Twist Rate: 1-7 Gas System: Carbine Overall Length: 23.875 inches Weight: 5.2 lb (83.2 oz) Barrel Finish: Nitride Suppressor Material: Hardened Stainless Steel BCG and Charging Handle: Included