When installing a CO/ALR outlet is there a recommended torque specification for the mounting screws? Unfortunately, I have some aluminum wiring in my home.
I think you're confusing Alumi-conn connectors (which do have a recommended torque) with CO/ALR. A normal CO/ALR outlet simply needs to be hand tight. I've never seen any specification listed for torque, nor have I ever needed to use my torque screwdriver on one.
If you need a number, use 14 in-lbs
According to this 2013 IAEI Magazine article on the UL 498 test battery, when UL is wiring up receptacles during the testing they perform to qualify a receptacle design for the UL listing mark, they torque the receptacle screws to 14 in-lbs, nominal.