ok...after many tinkering i finally got a good high percentage on the sidearm suppressor. if anyone wants to try it out, feel free to do so. as always BACK UP your game save!! in my game save, i found the sidearm suppressor in InventorySlot_2:

- sidearm_sup.png (18.87KiB)Viewed 2759 times
i changed the first C8 41 value to C8 49 and the second value to FF 49. doing this game me 83558340% (give or take a few). not sure if the first C8 41 has anything to do with the suppressor durability, but wth might as well change it, too. the first C8 41 will probably revert back to its normal value from C8 49, whereas the second C8 41 value will dwindle down from 83558340% to 0%.
i noticed that when i first changed the C8 41 value to C8 42, the durability got bumped up from 100% to 400%. i guess 83558340% durability is good enough to have for the sidearm, lol. i just need to find the special suppressor durability, and it's been eluding me for the time being -- cuz i wanna use the damn C8 Rifle, LOL!! if anyone has the location of the both the primary and special suppressor, please post it...TIA