Cav Arms from Mesa AZ made the original monolithic versions. When they went under the molds went to GWACS in Tulsa, basically the same as the last Cav version. This new KE version looks like it is somewhat evolved but then I can't see the internals. Seems like everyone that tried to make a regular lower out of polymer found out a regular buffer tube caused too much stress at the rear, which seems to be avoided with the monolithic design and some judicious thickening in that area. .
