The VBZ stands for 24" Varmint .22 LR barrel with two-tone light Brown laminated stock. The Z doesn't appear to really stand for anything but a lot of the variants have the Z in the letter string. There are variants in 22 Mag, 17HMR, 17 M2, 22 Hornet, etc. I'm guessing yours has a two-tone light brown laminated stock?
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