1990s semi-automatic .22 WMR rifles were introduced by Sturm Ruger, Savage, and Marlin , and more recently Remington. .22 WMR revolvers are made by by Taurus , North American Arms , Tanfoglio , Heritage Arms, and Sturm Ruger. .22 WMR semi-automatic pistols were produced by Grendel , AMT and Kel-Tec the