DANIEL DEFENSE GL/SSC 5.56X45 NATO ASSEMBLED UPPER RECEIVER GROUP The legend returns. The once unobtainable GL/SSC (Grenade Launcher/Sound Suppressor Capable) that helped put Daniel Defense on the map is now available to the masses for the first time. It features a versatile 12.5" Government profile barrel, a carbine length gas system, and Daniel's iconic and rugged RIS II rail system. FEATURES: 12.5 Chrome-lined, heavy-phosphate-coated government profile barrel Free-floating, battle-proven GL/SSC RIS II Rail System provides a real estate for accessories without affecting barrel harmonics Compatible with Suppressors and M203 mount Mfg: Daniel Defense