Lone Star Ordnance was originally out of San Antonio, TX. Later they moved to Arlington, TX (greater Dallas area).
They produced handguards, the famous Stowaway and later, Stowaway II grips. They had AR-15 and M16 parts, as well as parts for .30 cal M1 Carbines, M1 Garands, Springfields, 1911's, etc. They also refinished these arms, including duplicating the particular shade of parkerizing that was original to each manufacturer of these firearms.
As far as I know they did not make complete AR's. I don't think they made lowers.
And they gave good service.
Sadly they went out of business shortly after the AWB was passed.
I was recently in touch with the guy that owned LSO, and he said they are trying to get started again. I had a computer crash and lost that contact info.