These DRD U556 AR-15 uppers are chambered in the popular 556x45 NATO caliber. Capable of being taken down into component assemblies in less than a minute using no tools, the U556 uppers are ideal for covert transportation. This upper gives any AR-15 lower the ability to transform into a compact "suitcase" gun with just a swap of uppers! Bolt carrier group and charging handle not included.
Specifications and Features:
5.56 NATO chamber (accepts .223 Remington)
13" Free floating rail
Quick takedown for covert transport
For any standard AR-15 lower