Pull the Striker apart , so we can see the trigger group...1st Gen had a Bearing on the back and twin arms . 2nd Gen had 1 pivot bracket on the bottom of the magazine . 3rd Gen had 2 brackets on the bottom of the magazine.
In my experience- if one knows what they are doing it pretty simple to make a very fine trigger pull from any of them. Fred at Sharp Shooter Supply or Scott Null at Savagegunsmithing.com both do very nice trigger work.
Converting to rear grip is easily the simplest and Fred Sells a super trigger for $85.