Ruger's AR-556 MPR rifle has a rifle-length gas system which provides smoother operation and reduces felt recoil. The matte black oxide chrome-plated bolt carrier inside diameter and chrome-plated gas key inside diameter provides exceptional resistance to hot gases. Its lower receiver is fitted with Magpul MOE grip and a Ruger Elite 452 two-stage AR-trigger which offers a smooth, crisp, 4.5-pound trigger pull. The flattop upper receiver is made from forged aerospace-grade 7075-T6 aluminum and includes a forward assist, dust cover and brass deflector. Its handguard is free-floating for accuracy and features Magpul M-LOK attachment slots along the 3, 6 and 9 positions. The threaded, cold hammer-forged, 4140 chrome-moly steel barrel with ultra-precise rifling provides exceptional accuracy, longevity, and easy cleaning. The barrel also provides M4 feed ramps which improve operational reliability, while the American Flag finish provides corrosion resistance. The AR-556 MPR has a Magpul MOE SL collapsible buttstock on the Mil-Spec buffer tube and includes a 30-round Magpul PMAG.
Brand Ruger
Category Tactical Rifles
Caliber 223 Rem / 5.56 NATO
Model AR-556 MPR
Stock Finish Black
Action Semi-Automatic
Sights None, Optic Ready
Capacity 30+1
Muzzle Muzzle Brake
Hand Right
Length of Pull 11.1"-14.4"
Metal Finish American Flag Cerakote / Black Nitride
Oal 35"-38.25"
Receiver Material 7075 T6 Aluminum Forged
Safety Safety Selector Switch
Stock Description Adj Magpul MOE SL
Stock Finish Group Black
Stock Material Polymer
Thread Pattern 1 / 2"-28 tpi
Trigger Two-Stage
Twist 1:8"
Weight 6.8 lbs
Barrel Description 4140 Chrome Moly
Barrel Length 18"
Caliber Dictionary
The Below Information Has Been Provided From Our Gun Caliber Dictionary And Is Meant For Informational Purposes Only. It Is Not Intended to Describe The Unique Specifications For This Ammunition.
The 5.56X45mm NATO cartridge was designed by James Sullivan, a member of Eugene Stoner's engineering team that developed both the M16 rifle and its original cartridge. The 5.56X45mm NATO was adopted by the U.S. military in 1964 and by NATO in 1980. With bullet diameter of .224-inch, the original M193 military cartridge used a 55-grain bullet at 3250 fps; the current M855A1 cartridge, developed by FN, uses a 62.5-grain bullet at 3020 fps, offering greater range and better penetration. The civilian version of the 5.56X45mm is 223 Remington; the cartridges are dimensionally identical but military chamber dimensions and specifications for military brass are different. It is considered safe to use 223 Remington ammo in a 5.56X45MM NATO chamber, but not a good idea to use 5.56X45mm ammo in a rifle specifically chambered for the 223 Remington. Although the stopping power of .22-caliber bullets remains controversial the 5.56X45mm has served well in now multiple generations of M16 rifles. — Craig Boddington
