I have them on a few SKS's and a Marlin 22. They're a great poor man's Assault Rifle. Functional and reasonably sturdy.
The Fiberforce is the fixed Dragunov design. It's OK. Solid and decently ergonomic. The Strikeforce costs twice as much and has folding stock, rails, adj cheekpiece, etc.The folding stock is very handy for a pickup/ATV rifle. Depending on how the front band fits, probably no downside to any of the sidefolders.