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A "First Edition" P290 was on display:
I fondled it a bit, and it was clear that it uses the DAK trigger. Here is their P290 poster, which describes grip options:
Here is the newly-introduced P210:
The trigger was excellent on the specimens that I handled. Also, there was no magazine disconnect. The safety was also easier to manipulate that earlier P210s.
The SG511 appears to be 50 BMG:
SG 553-2 LB with GL5349 Grenade Launcher:
Here is the SIG50, which appears to be using the McMillan 50 BMG action: