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I couldn't find any other attachment points. The handguard is snug as f**k right now without this. Plus the screws in the pics dont wven fit through that bracket thing
It kinda looks like something under the top of the handguard around the barrel just behind where the 3 top vents are, look above and see if that's it???
The screws look like possibly spares for the rear upper screw? It says on Zahal's website that the lower rail 'clamps' to the barrel, so it would probably be hidden under the top rail... they may have shipped the wrong screws for the lower clamp, or maybe it's not even supposed to be there?? I dunno, might have to Email or post this in Zahal's dealer section here, they seem to be very quick replying to things.
IIRC when installing the B&T quad rail on a CZ858, that there were clamps on the bottom rail section.... Even though it didn't seem to need it, they kept the lower section in place for aggressive use of a vertical grip I suppose.
ETA
This is the B&T rail.... Might at least give you something to look for.
I actually got it figured out. It was a barrel clamp that holds the lower handguard. Saying that, I really don't see how it need it. It's a crazy tight fit. Thanks guys