Hi Joel, Just the barrels are different. The Savage MKII FV has a heavy 16.5" carbon steel threaded barrel

They both have a 21 inch barrel in the .17

just the barrels are different The V is a 21 inch Heavy barrel the F is a 21 inch standard barrel neither is threaded (the 22 has the 16.5 threaded barrel not the .17) specs for the FV here UPC: 062654267246

Description: SAV MARK II-FV 17M2 BA 5RD B
Brand: Savage Arms
Model: Mark II-FV
Type: Rifle: Bolt Action
Caliber: 17 Mach 2
Finish: Blue
Action: Bolt Action
Stock: Synthetic, Black, Checkered
Sight: Scope Bases Installed
Barrel Length: 21 Heavy Barrel
Overall Length: 39.75
Weight: 6 lbs
Capacity: 5+1
# of Mags: 1
Safety: Manual Safety
Receiver: Blue
Features: Rifling: 1-9, Free Floating & Button-Rifled Barrel;
5 Rd Detachable Magazine, AccuTrigger and the F here UPC: 062654267024

Description: SAV MARK II-F 17M2 BA 5RD B
Brand: Savage Arms
Model: Mark II-F
Type: Rifle: Bolt Action
Caliber: 17 Mach 2
Finish: Blue
Action: Bolt Action
Stock: Synthetic, Black, Checkered
Sight: FT: Post RR: Adjustable
Barrel Length: 21
Overall Length: 39.5
Weight: 5.5 lbs
Capacity: 5+1
# of Mags: 1
Safety: Manual Safety
Receiver: Blue
Features: Rifling: 1-9, Free Floating & Button-Rifled Barrel;
AccuTrigger

The only difference is the V "Varmint" has a "Heavy' 16.5" carbon steel barrel" threaded barrel. All else is the same.