Tanfoglio / EAA / IFG Witness Trigger Return Spring (PR034)
I dry fire a lot, although I have never broken a TRS on my Tanfo's I do spring changes 2-3 times a year depending on round count. To keep the spring from launching into orbit when removing it. I recommend placing masking tape along the top of the frame and the mag-well. That way, during take down when you remove your punch you won't lose the TRS. During assembly, I recommend you use a slave-pin to hold the TRS in place so you can install the role-pin easier. And that way it won't "get away" from you.
It is very easy to launch one of these little things far into never ever will you find it land. Extras is darn GREAT idea!
Not hard to launch one of these into orbit during assembly. Its a good part to have a few spares!