.22 Remington Automatic
The . 22 Remington Automatic ( also known as the . 22 Remington Auto and occasionally . 22 Rem Auto ) is a . 22in ( 5 . 6mm ) American rimfire rifle cartridge . 
<triplet> .22 Remington Automatic <subj> American <obj> country of origin <triplet> rimfire <subj> cartridge <obj> subclass of