Yes there is. Cimarron has them and possibly VTI as well. They're not cheap. Getting a hammer to "drop-in" without fitting would be pure luck, but it can happen. However, if the safety-hammer you are replacing is old enough, you may also need a new hand and/or trigger. I think the hole in the hammer that the hand fits into is larger than it used to be. It's been a while since I looked at those parts.