I added a section to the website where I will post a bi-weekly or monthly review of the AR-15 rifles and upper receiver assemblies that are listed at http://www.colt.com and http://www.brownells.com. Over time, this will give a collector an idea as to when an product enters and exits the retail market since catalogs don’t seem to be produced anymore. You can see our first analysis/listing here: https://thecoltar15resource.com/2019-2/