General Characteristics
Varmint rifles can typically be distinguished from other light-caliber hunting or plinking rifles in the use of heavier barrels and (often) omission of open sights. Use of magnifying optics allows for more accurate fire (often on very small, distant moving targets). Barrels will generally be free-floated, and other accurizing techniques will be performed, either by the manufacturer or the owner. The stocks will generally have wider forends, designed for use on stable sandbag rests, and high combs for easy use with optics.
Since part of the definition of a "varmint" is that it is a nuisance, varmints are not stalked, but rather they are hunted from a fixed position. This makes weight of little consideration in a varmint rifle, so heavy barrels are common. Varmints are also not subject to the same bag limits as game animals are, so far more shots may be fired. The heavier barrel is, in general, more accurate than a light barrel, plus the extra mass helps reduce the felt recoil and absorb the heat from more shots before expanding and potentially reducing accuracy. Folding shooting benches and sandbag rests help provide a stable base for the shooter, allowing the maximum accuracy to be extracted from the rifle.
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