This AR-15 rifle build kit comes with a 16" barrel and a upper chambered in .223 Remington / 5.56 NATO. A carbine buffer tube assembly, lower parts kit and grip. Just add a lower receiver to complete your project.
-CALIFORNIA PROPOSITION 65 WARNING:-WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information: www.P65Warnings.ca.gov