Rimfire firearms don’t immediately come to mind when one thinks of SIG Sauer, a company that prides itself on its tactical guns. But while .22 LR firearms aren’t a major part of SIG’s DNA, it hasn’t ignored them, either.
Converting a DA/SA pistol like the H&K USP to Double Action Only (DAO) typically requires the installation of proprietary parts. Having a certified armorer or qualified gunsmith do the work ensures the gun’s safety and reliability.