Takedown barrel is removed from the upper receiver by moving the slider bar towards the breech, rotating the barrel and pulling it free (no tools required). For installation, slide the barrel into the upper and twist until it locks. The takedown mechanism provides a repeatable point of impact.
For a larger cartridge, replaceable barrel kits chambered in .300 AAC Blackout are available on ShopRuger.com. This range-ready barrel's headspace is set at the factory and comes complete with a metal flip-up elevation- and windage-adjustable front sight and two, 30-round metal magazines marked with "300 AAC BLACKOUT" to ensure easy differentiation. Patented chrome-plated, two-stage piston with multi-stage regulator provides a cleaner, cooler running, reliable firearm with superior operating endurance. The two-stage piston provides a smooth power delivery stroke to the bolt carrier. The Ruger® Elite 452™ AR-Trigger is a two-stage trigger that offers a smooth, crisp, 4.5 pound trigger pull. It features a full-strength hammer spring for consistent primer ignition and a lightweight hammer that enables a 30% faster lock time over standard MSR triggers. Features front and rear folding iron sights. The front sight is both elevation- and windage-adjustable, allowing the zero to stay with the barrel when you swap it out. Lower receiver is fitted with the Magpul® MOE® grip and MOE SL™ collapsible buttstock on the mil-spec buffer tube. Precision-rifled, chrome-lined, cold hammer-forged Mil-Spec 41V45 chrome-moly-vanadium steel barrel ensures accuracy and longevity. A Ruger® flash suppressor is provided, and the 1/2"-28 threaded barrel allows for standard muzzle accessories to be installed. Slim, lightweight KeyMod™ handguard for reduced overall weight. Also includes: convenient carry case; lock; three, 30-round Magpul® PMAG® magazines.
Specifications:
Caliber: 5.56 NATO/223 Remington
Stock: Black Synthetic, Collapsible
Sights: Folding Iron Sights
Barrel Length: 16.12"
Overall Length: 32.75" - 36"
Capacity: 30
Twist: 1:8" RH
Width: 2.50"
Height: 7.75"
Weight: 7.1 lb.
Thread Pattern: 1/2"-28
Finish: Manganese Phosphate / Hardcoat Anodized
Length of Pull: 11.10" - 14.40"
Grooves: 6
The information below comes from our Gun Caliber Dictionary and is for
general reference only. It does not describe the specifications of this
particular item.
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
