Ruger MR556A4 upper receiver assembly in 5.56mm NATO with 14.5-inch barrel. Complete upper kit for AR-platform rifles with quality components and reliable performance.
The Ruger MR556A4 upper receiver kit represents a straightforward, no-nonsense approach to AR-platform rifle building. This complete upper assembly arrives ready to mate with your lower receiver, eliminating the need to source and assemble individual components.
This upper kit provides everything needed for the upper half of your rifle. The 14.5-inch barrel strikes a practical balance between velocity and handling characteristics, making it suitable for both defensive and recreational shooting. Ruger's manufacturing ensures consistent quality and reliable function across thousands of rounds.
The MR556A4 upper is an excellent choice for shooters building their first AR or those seeking a proven, factory-assembled upper from a respected manufacturer. Simply attach to your preferred lower receiver, and you're ready to shoot. No gunsmithing required.
This is a straightforward tool for serious shooters who value reliability and American manufacturing.