Sturm, Ruger & Company, Inc. announced the availability of three, AR-style upper receiver assemblies featuring the innovative two-stage, piston driven performance of the SR-556 family. These ...

The MR556A1 Upper Receiver Kit allows high quality AR-style rifles to be retrofitted to HK's famous pusher rod operating system. An MR556A1 Upper Receiver Kit includes a complete barrel assembly ...

the AR-556 doesn't hold much in the way of surprises. However, Ruger did add a few unique touches along the way. At the heart of the rifle, the upper and lower receivers are forged of 7075-T6 ...

it comes standard with a flip-up rear on its optics-ready flat-top upper receiver. There’s a lot of gun for the money here, and the Ruger AR-556 is our NRA Gun of the Week. Watch the video ...

The AR-556 has a barrel length of just 10.5 inches and an overall length of 25.3 to 27.9 inches. It is 7.2 inches high. Equipped with a standard buttstock, the “pistol” would be an NFA firearm.

The gunman in the Texas church massacre was armed with a Ruger AR-556 -- a type of AR-15, the military-style rifle that has been used in many other recent mass shootings. The AR-15 was designed ...