I thought the only true hi-capa is the Para series of 45's, and the only real mechanical difference was the fact that they off set stack the ammo allowing up to 14 rounds vs the Springfield Operator which is a single stack of ammo up to 7 and classifies it self as a 1911-A1. Otherwise I thought the term Hi-capa in airsoft started with Tokyo Marui and its 1911 hi-capa series in order to avoid using trademarks from companies such as Springfield, and any other airsoft company follows suite for the same reason.
If you have anymore info on it though please post it, can't get enough information on 1911's
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