When the members of Calguns.net started the OLL revolution, the initial semiautomatic firearms that were imported into California and sold were unlisted AR type lower receivers. The three letter accronym OLL - for Off List Lower - was quickly adopted by both the pro gun community and the California Department of Justice and the anti-gun community. OLL has now become synonymous with the import, sale, manufacture and assembly of firearms that were once thought to be "Assault Weapons" and therefor unobtainable under California law.