https://shadowsystemscorp.com/product/mr918-combat/
https://shadowsystemscorp.com/product/mr918-elite/
https://shadowsystemscorp.com/mr918/
Here's something fairly new to market. I haven't seen these discussed yet and apologize in advance if there's an existing thread.
Anyway, the pistol(s) in question appear to be a Nomad Defense Gen4 19 frame coupled with a Shadow Systems slide and barrel. Factory spring weights are being used with the exception of a Taran Tactical connector.
I really like the idea of the permanent beavertail and wish Glock would do something like this on their pistols. Price seems good for the features. I might have to pick one of these up.