Update 1.3:
Adjustments to fit and display RPG-7 icon properly.
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Update 1.2:
It seems I've fallen into the rabbit hole. A couple more weapons with broken icons have been addressed in this update.
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Update 1.1:
After installing a missing patch for ZRP from the Repair Kits Revamped mod, a couple of my edits are now obsolete and have been removed. I am an idiot and didn't check the contents of the mod pack clearly enough.
The weapon icon fixes still seem functional at this moment and have remained unchanged.
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• About this fix:
I created this fix after noticing invisible inventory icons while using S.T.A.L.K.E.R. Shadow of Chernobyl 'Starter Pack 2019' in conjunction with 'Repair Kits Revamped' mod for SoC 1.06.
• Disclaimer:
**I do not own any of the mods. This fix is not official and very likely a band-aid solution for a problem that very few encounter. Attachments and unique models of these guns may still have broken icons. Use at your own risk.**
• Installation Instructions:
Simply copy the Gamedata folder into your S.T.A.L.K.E.R. game directory and "Replace All" when prompted.
A list of changes and default values are listed within this .zip in case you need to revert or prefer to manually edit the values.
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• What will this change?
-AS VAL width is decreased by 1 unit. (Previously 5, now 4)
-"RPG-7" width is decreased by 1 unit. (Previously 6, now 5) 
-"RPG-7" height is decreased by 1 unit. (Previously 2, now 1)
-Walther P99 width is decreased by 1 unit. (Previously 2, now 1)
-Walther P99 icon is now visible.
-Colt M1911 icon is now visible.
-Sig P220 icon is now visible.
-HK USP .45 icon is now visible.
-RPG-7 icon is now visible.
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MOD LINKS:
• STARTER PACK 2019 - https://www.moddb.com/mods/starter-pack/downloads/starter-pack-2019-fixed-re-upload
• Repair Kits Revamped 1.05 - https://www.nexusmods.com/stalkershadowofchernobyl/mods/1040