Hello PHMadness

Good haul of ZKK parts... the lozenge shaped part with a screwdriver end is a bolt disassembly and trigger adjustment tool.

Appears you have all the parts to install the set trigger, you will need both the lighter shim spring and the heavy spring, the light one nestles inside the heavy one and stops the trigger from rattling when unset. Long side installs uppermost.

See the following image for assembly:

Remove standard trigger and anti-rattle spring by removing Pins 1 and 3 (it should have been fitted with the light spring only)

Install the set trigger by replacing Pin 3

Install Pin 1 with both the inner and outer spring nestled together (long side uppermost)... the end of the light spring fits into a small notch at the rear of the set trigger... may need a bit of fiddling with a fine screwdriver tip to get it to click into place.

Using needle nosed vice grips (well padded with leather to prevent marring the trigger bow area) compress the end of the heavy spring until Pin 2 can be installed. The end of the heavy spring will be held under great tension by this pin... it acts as the 'sear kicker' when the set trigger is released.

The small screw in the side of the set trigger adjusts release pressure... once installed, the trigger is set by pushing forward till it clicks... release pressure is typically about 8oz but can be adjusted a little with the screw. Using the special tool, loosen the screw (anti-clockwise) to increase the set trigger release weight, tighten it (clockwise) to decrease the set trigger release weight. Of course check your rifle is unloaded before these tests

PLEASE NOTE:
If the set trigger release weight is set too light (ie it is screwed in too far) the trigger may not set at all or worse may release unexpectedly all by itself. Needless to say, this condition is extremely dangerous

Once you think you have it adjusted properly, set the trigger once more by pushing it forward, then bounce the butt a few times on a firm surface to ensure it won't release unexpectedly.

If you don't feel confident about making these set trigger adjustments, please take the rifle to a competent gunsmith.

Hope this helps...

Cheers

TM