HVA actions in a 20.5" barrel were in the 4100 lightweight and the 4000 lightweight. The 4100 has open sights and the 4000 has no sights and has a MC stock.
The 7000 imperial lightweight also has an HVA action I believe, and has a 20.5" bbl, select wood, and 3-leaf folding rear sight.
You likely have a 4100, assuming you have the open sights.
Last edited by setch; 09/17/14.
