Its not an expensive scope. I've had it on a couple platforms. I like it because its small and lightweight. With just enough magnification for your average shooting scenario.
16" barrel chambered in 5.56. i want to say 1/8 but I'm not sure. Probably can look on interweb and find out. I'll try to remember to check it tonight.
The Ruger AR-556 semi-automatic, M4-style, direct impingement modern sporting rifle is American made and constructed from top quality components, including a forged 7075-T6 aluminum upper and lower receiver and a cold hammer forged, chrome-moly steel barrel with M4 feed ramp cuts. Chambered in 5.56 NATO, the AR-556's carbine length, flattop, M4 design is fully configured with a Ruger rapid deploy folding rear sight, MILLED F-height gas block with post front sight, forward assist, dust cover, brass deflector, telescoping 6 position stock, improved trigger-reach grip, enlarged trigger guard and one 30-round Magpul PMAG. 16.10" medium contour barrel with Ruger flash suppressor and 1:8 twist. Milled gas block has QD socket and bayonet lug.