It depends on Year of manufacture. Llama pistols made before 1956 were forged and machined. They were excellent pistols that saw the Civil War and are still around today. The Llama special was a close clone of the 1911, and was made until the 1940s. Not fully compatible with a 1911, it is an excellent pistol, fully forged and a nice collection piece...one of the best pistols in Europe at
that time.
However, Llamas made from 1956 until the early 1990s were made by the Investment casting process and they have a characteristic ventilated rib. They are mediocre pistols and not 1911 compatible.
The last Llamas, made fron early 1990s until the early 2000s, the Llama Max, are 100% 1911 compatible and very well made pistols, with tough steel ( I engraved one...very hard on the burin). They have much better steel and craftsmanship than all the Philippine made Rock Island pistols and STI's.
In short: if the pistol has a ventilated rib, my advice is not to buy it. If it lacks it, it is a better buy than a brand new Philippine pistol.