If memory serves me correctly, the entire 1911 function was tweaked, to include "flared" muzzle ends on the barrels...(Belled, if you will). They came in bright blue, bright stainless and (perhaps) other finishes. Quite unique. The reasoning for the "El" denotations was on account of the propinquity of South American countries usage of 1911's "and" 38 super.
Hope this helps,
Stay Sharp, Capt. Chris