The L461 was the short action, the L579 was the medium action, the L61R was the long action. The AI is a L461 with the bolt shroud, the AII is a L579 with the bolt shroud, the AIII is the L61R with the bolt shroud, & the AV is the L61R with the bolt shroud & a slightly longer rear tang. Vixen, Forester, & Finnbear are the marketing monikers for the short, medium, & long actions, respectively, regardless of the action stamping. So, it's L461, AI or Vixen for a short action, then L579, AII or Forester for the medium action and L61R, AIII or AV & Finnbear for the long action. Most everyone here refers to the different models by the action stamping to better define what it is, as the terms Vixen, Forester, & Finnbear apply to all variations of the short, medium, & long actions.