Just don't add BG crusher, Tar Cherry, Pnade, or any other obvious items and you will be fine. To be honest, the only gun worth adding is the mg4ke because there is a much lower chance of getting reported. The co-op guns (ppsh, stg, ect.) are reasonable to add though. Maybe you can add the armors too but I wouldn't risk my account for just some armor.
don''t seem they are banning for adding guns in the mean time!! i have 10 accounts with added guns that are still active
the only accounts that were banned are those that i used the dv euro hack in them!! seems they didn't ban for using roundskipper in lockdown! my account that i have 9999 badges of ld still alive and i used gun add in it but not the euro hack!!
i would say you can add guns but as mentioned above just be reasonable with the guns yo add!