.22 caliber, or 5.6 mm caliber, refers to a common firearms bore diameter of 0.22 inch (5.6 mm).
Cartridges in this caliber include the very widely used .22 Long Rifle and .223 Remington / 5.56×45mm NATO.
.22 inch is also a popular air gun pellet caliber, second only to the ubiquitous .177 caliber.

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    Umarex Ruger Impact Max .22 Rifle Issue

    I need to remove the factory optics rail from the gun. Remover the 4 hex bolts, the rail now slides back & forth but will not separate from gun. the grooves do not reach the barrel break or the rear cap. Tried spreading the base wit needle-nose pliers but the cast aluminum material won budge...
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