The Ruger AR-556 Pistol has a 10.5-inch barrel that is cold hammer-forged of 4140 chrome-moly. The 9-inch, free-floated, handguard offers MLOK on the sides and bottom, with a traditional Picatinny rail running down the top. The gas system is direct impingement and takes advantage of the entire length of the handguard as a “carbine-length”.  The upper enjoys traditional features like a brass deflector and a forward assist, as well as a dust cover. 
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https://www.usedguns.com/Item/Details/RUGER_PISTOL_AR_556_PISTOL/E153DF5BB7C347FFA8D0351481C17E46

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