Underneath the hammer you’ll find the ambidextrous safety. The progressive layout incorporates external safeties pinned In the grip and Found underneath the hammer. They are sometimes encountered today with their typical black plastic S&W-branded grips changed with aftermarket solutions that provide better ergos, for instance this example with nicely-worn Pachymayr https://smith-and-wesson-m-p-1581470.ttblogs.com/17544377/about-firearms-forum