How accurate is a DSA STG58A? What type of groups can it get at 100-500 meters?

It's a battle rifle, expect to average around 2 MOA.  I can hit a 12"x12" steel plate at 400 meters prone.  They're battlefield accurate.

What he said.  2, 2.5, maybe 3 max MOA.  Would lean toward the 2-side of that, though, as the Steyr barrels are very good barrels.

I had a DSA for a while and 2 to 3 MOA is pretty normal.  The loose sight on the lower receiver is part of the problem and the basic design is the rest.  That's wasn't very important in a battle rifle in the early 1950s.

They don't use many Steyr barrels, if any.  The DSAs are the best of the Frankenfals.  They put a good finish on the used parts and use decent US parts.  They say they have a version that uses all new-condition surplus and US parts.  You should see how much that version costs.

Quoted: 3 month wait on type 2 rxvr StG58As.

RAF, glad DSA is consistent.  They told me two months on Friday.

Quoted: I had a DSA for a while and 2 to 3 MOA is pretty normal.  The loose sight on the lower receiver is part of the problem and the basic design is the rest.  That's wasn't very important in a battle rifle in the early 1950s. They don't use many Steyr barrels, if any.  The DSAs are the best of the Frankenfals.  They put a good finish on the used parts and use decent US parts.  They say they have a version that uses all new-condition surplus and US parts.  You should see how much that version costs.

I believe all the STG-58A's use the Steyr barrel.
That package built on a DS Arms receiver is about $900.
In my opinion best value in the FAL area.