Save a few bucks and grab one of these uppers. These are uppers built from extra parts, orders that customers never picked up or changed their mind to something else, uppers or parts that have imperfections like scratches or dings, blem or random assemblies used for display/demo or other reasons.
16″ or longer .223|5.56 barrel (maybe Wylde, stainless, black, or NATO)
Free float handguard, maybe Keymod or M-LOK or IRS
Steel gas block
Stainless gas tube
*Because these are pre-built they cannot be customized/changed