Guns Installing the SSVI Tyr Trigger David Reeder August 30, 2015 Join the Conversation Remember Merrill's review of the SSVI “Tyr” after-market Glock trigger? Damon Young has published some videos where he goes through the installation process. Here's a look at putting one into a Glock 43. Here's an earlier video showing how to install it into a full size. Looks like it's simple enough even I could do it – and that's saying something.