Ruger 5.56Mm Nato 223Caro Upper

RUGER

SR-556 OPERATING SYSTEM w/UPPER RECEIVER ASSEMBLY

Upgrades your existing AR to the SR-556 2-Stage piston-driven operating system w/upper receiver assembly Features chrome-lined cold hammer-forged barrel & chrome plated bolt carrier group Includesfolding back-up iron sights quad rail handguard soft-sided case & (3) magazines Caliber 5.56mm NATO/.223 Caro BBB 16.12"