The Ruger AR-556 is a distinct combination of Ruger innovation and B5 furniture.
 
The AR-556 MPR features a 13.5" Free Float M-LOK compatible hand guard along with a B5 Bravo Stock and B5 Type P23 Pistol Grip. The barrel is an 16.1" 4140 Chrome-moly steel barrel which has been cold hammer forged and features a 1:8" right hand twist rate. Additional this rifle features a rifle length gas system along with a pair of forged 7075-T6 aluminum upper/lower receivers. The Ruger AR-556 provides you with an exceptional value that can't be overlooked. All backed by an amazing Ruger warranty which is second to none in the industry.

Specifications and Features:

5.56 NATO (accepts .223 Remington)
16" 4140 chrome-moly steel Cold Hammer Forged Barrel
1:8" Twist
5 Groove Rifling
Muzzle Threaded 1/2-28 TPI
30 Round Magazine
Carbine Length Gas System
13.5" Free Float M-LOK Compatible Hand Guard Mil-Spec Diameter Buffer Tube
Magpul MOE Pistol Grip
Magpul MOE SL Collapsible Stock
Lower/Upper are made from Aerospace-grade 7075-T6 Aluminum Forgings
Flattop upper receiver with forward assist, dust cover, brass deflector
Bolt is machined from 9310 alloy steel
Ruger Elite 452 AR-Trigger (2-Stage Trigger)
Chrome plated bolt carrier/Gas Key
Ruger Muzzle Brake
Type III Hard Coat Anodized Finish
Matte Black