Hi all I'm very new to this so it's a learning curve :) please excuse

My buddy has an Edge, I have an Axis.

So we purchased a trigger upgrade kit for both. (over travel screw & spring )

Came to install on both our rifles and found he has a different trigger set up to mine in that his overtravel spring/bolt location isn't threaded, whereas mine is (you just unscrew the OEM spring and away you go)

So, i did a little research and asked savage a few questions, to find the edge was the first rifle introduced and they, for some reason, just changed the name to Axis with everything the same setup etc so basically it was just a name change.

My question is why is his trigger different to mine

Thanks in advance