Get it from Ontarget guns. You can make cut one out of an aluminum can but the ontarget ones are stainless steel. (For a 22/45, you have to make your own.) You just slip it in when you field strip the gun. If you can field strip the gun, you will be able to slip this in. There are instructions and pictures at the Ontarget site. Bill at ontarget is as good an internet vendor as they come so don't worry about that aspect. And, your shipping will only be a dollar or so for the trigger shield.