AWP and ARP are not the same. AWP prevent the pins from walking out of the lower receiver, ARP does that too and adds 2 arms on either side of the receiver and makes a physical connection between the 2 trigger pins and prevents the pins from rolling in place and causing things like unpredictable double fires....... that said ARP are a mil-spec style trigger thing and add no value in a box trigger like the one above.
Same thing buddy.