System Shock 2 · Combat skill
Standard weapons skill
Standard is the combat skill for Standard weapons. The Skills & Upgrades guide calls the category useful early and later, and says level 6 enables use of the assault rifle.
How it works
That guide recommends investing in Standard, but its assessment is not an objective ranking. The excerpt does not list every weapon governed by the category or give detailed level requirements beyond the assault rifle note.
Read the supporting references
Check the edition and source version for patch-specific details. Guide methodology.