Ruger® 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 four-position chrome-plated gas regulator can be adjusted for optimum reliability and superior operating endurance. The gas system may be closed completely for manual operation during training or when using a suppressor*.
Folding backup iron sights include a windage adjustable rear sight and an elevation adjustable front sight. These sights provide a solid, reliable aiming system that can be folded out of the way to make room for optics, but can be instantly redeployed if needed.
Six-position telescoping M4-style buttstock* is mounted on a Mil-Spec diameter tube.
Fluted barrel (for reduced weight and improved barrel cooling) features an SR-556®/Mini-14®-style flash suppressor* mounted with a 5/8"-24 thread.
Round, smooth-sided Ruger® Lightweight Adaptable handguard with flattop receiver features a Mil-Spec 1913 Picatinny rail at 12:00 position that extends the full length of the handguard. Drilled and tapped for additional rails at the 3:00, 6:00 and 9:00 positions (two additional rail sections included), providing ample space for mounting sights, lights, lasers or other accessories.
Hogue® Monogrip® pistol grip* adds comfort when carrying or shooting.
Chrome-plated bolt and chrome-plated one-piece bolt carrier with oversized and radiused rear bearing surface.
soft-sided case; three finger-grooved rail covers.