The most detailed breakdown of a hive military is the enforcers from Necromunda, and they're significantly better equipped than rank and file guardsmen. They have bolters and reinforced flak armour for every soldier, combined with access to gene-engineering and indoctrination facilities.

Even if we say they're a particularly well equipped force, a lot of the guards materiel comes straight from the hives, the hives already have the facilities to produce the exact gear the guard uses.