The Welsh Willy trigger was basically a copy of the GRT III only with a longer trigger blade. After trading emails with him, I found out that while he still sold them, he didn't advertise them on his website because shooters would buy one, not follow the install instructions, then come into his shop complaining how his trigger had screwed up their guns. He may well still sell them but you'd have to email him and ask if he still has a few laying around.Myself and others have posted about the fact that the GRT III does fit and work in the Hatsan Edge/Striker/1000X rifles, it's just too short to really get your finger on and you'd have to find a way to lengthen the blade on it if you decided to get one. Here's the picture another member posted of what that GRT III looks like in a Striker and what I meant by the blade needs to be lengthened.
I put the rc roller bearing in mine and love it.YMMV