Hi, Im wondering if it can be use both hammers in one or other platform without issue

My stock g17 valve blocker and that little screw are very loose and the shootig performance are bad because of that, and I need a replacement, so, I'm in between guarder and GM set. Which one should I shoose?

i have been noticing a few of these pistols around, and i am just wondering if they are any goo, and if KWA are a goo make? thanks.