Sako Quad bolt-action rimfire rifle paired with a dedicated Burris Quad scope. The Sako Quad features an interchangeable-barrel system designed for .17 Mach 2, .17 HMR, .22 LR, and .22 WMR, using the appropriate barrel and magazine. The Burris Quad scope was designed to complement this system, with color-coded reference markings for recording settings for different calibers.

I am the original owner and have not even sighted in the rifle. 
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