By Andrew Chung

(Reuters) -The U.S. Supreme Court on Monday barred two Texas-based manufacturers from selling products that can be quickly converted at home into firearms called "ghost guns," granting a request by President Joe Biden's administration to once again block a federal judge's order siding with companies.

The justices lifted Fort Worth-based U.S. Judge Reed O'Connor's Sept. 14 injunction barring enforcement of a 2022 federal regulation - a rule aimed at reining in the privately made firearms - against the two manufacturers, Blackhawk Manufacturing and Defense Distributed.

The decision marked the second time that the justices acted against an order by O'Connor in the case. In August, they halted the judge's previous decision blocking the regulation, reinstating the rule while an appeal proceeds.

The administration had said O'Connor's decision to grant an injunction favoring ghost gun kit makers despite the prior intervention by the justices "openly flouted" the Supreme Court's authority.

(Reporting by Andrew Chung in New York; Editing by Will Dunham)