Ruger AR-556 MPR 5.56 NATO Semi-Automatic Rifle | 18" Cold-Hammer-Forged Barrel, Free-Float M-LOK Handguard
The AR-556 MPR is Ruger’s enhanced, full-size AR-15 platform that pairs a medium-profile, cold-hammer-forged 18 inch barrel with a rifle-length gas system for smoother cycling and reduced recoil impulse. Built on a 7075-T6 aluminum receiver set and equipped with Ruger’s two-stage Elite 452 trigger, this 2020-production rifle offers a factory-tuned, 4.5 lb pull and match-ready 5R rifling—all in a package that remains lightweight, modular, and ready for accessories.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Condition: Excellent – Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling – Sharp lands and grooves.
Specific Condition Notes: Minimal markings from previous handling and use; surfaces remain free of corrosion and the action cycles smoothly.
What’s Included
- 1× 30-round aluminum STANAG-pattern magazine with orange follower
This MPR (Multi-Purpose Rifle) variant uses a nitrided 4140 alloy steel barrel threaded 1/2-28 for muzzle devices or suppressor use. The 15" Ruger free-float aluminum handguard offers full-length M-LOK slots and a continuous top rail for optics and accessories.
The factory Elite 452 two-stage trigger breaks at a consistent ~4.5 lb, giving shooters a clean first stage take-up followed by a crisp second-stage let-off—ideal for both precision and practical shooting.
A six-position Magpul MOE stock and matching MOE grip provide adjustable length of pull and a familiar ergonomic interface, while the rifle’s matte black hard-coat anodized finish protects the receivers against wear.
Manufactured in Mayodan, North Carolina, with serial prefix 857-, this rifle reflects Ruger’s post-2017 MPR production upgrades, including the rifle-length gas system that complements the 18" barrel for improved dwell time and softer recoil.