Australian International Arms - AIA M10 No. 4 Mk. IV

[BigBangTheory]

I happened upon this thread and was hoping you fellow AIA M10 owners could help me with an issue.
I recently found and acquired an M10-A2 from the original owner (took forever to find one, even longer to find an owner willing to sell), he claimed to have never fired it and it does look to be the case (perfect bore, bolt, no wear marks, etc).
Anyway I have yet to fire it myself but once I got it home I did notice something that I hadn't notice while inspecting it upon purchase.

The trigger is not under any sort of spring tension, it just sort of dangles, freely able to swing fore/aft until it makes contact with the sear. And when I say freely I mean freely, I noticed it as I lifted the rifle off my work cradle and rotated the rifle 90deg and set the butt on my bench (barrel pointing up), I heard a faint metallic 'clink'. I first scratched my head, set it back in the cradle but couldn't find what made the noise, lifted it again and again heard the noise. After doing it a few more times I finally noticed it was the trigger flopping back and forth.

Since info and IPBs for the AIAs are non-existent on-line (or my google-foo just sucks) I pulled up some Lee-Enfield IPBs and it doesn't seem that there is any sort of trigger spring shown on them either. Mine pretty much matches the SMLE parts (do their triggers just flop around? If not, what keeps them from doing so?)

PARTS GUIDE

I also can't find any indication of a missing spring, no slots, recesses, or guides to hold one, no wear marks where one might have rubbed, nothing to indicate diddly.

So is this normal?
I've never owned or used a rifle where the trigger just flops around like this and it's a bit startling, I'm used to reaching for the trigger and NOT feeling a limp noodle dangling there.
BTW I did contact the original owner and he said he had never noticed it.
Any help would be appreciated......