Sturm Ruger AR-556 Complete Upper Receiver (5.56mm NATO) with Free-Float M-LOK Handguard
This Sturm Ruger AR-556 complete upper receiver is chambered in 5.56mm NATO and built on an AR-pattern flat-top receiver with a full-length Picatinny top rail for optics and accessories.
Configuration includes a free-float M-LOK handguard, forward assist, ejection port dust cover, and a factory-style muzzle device.




