Okay, OP...
You said "Precision Gun".
To me that means a minimum of 20" with a pref towards 24" in bull barrel. Any person that would say
that the UBR was too heavy or out of balance is not talking of a precision rig as I stated as I understand it.
The UBR is probably the best stock for a precision AR rig, both small and large frame, to come down the pike. The PRS is "mostly" for
those with an esoteric human body or of a chosen scope mount. Yeah, I own one PRS that's never been installed,
but the two (2) UBR stocks have never failed me on precision ARs in .223/5.56 or the .308 family.
Hell, it's the perfect stock for the 458 SOCOM with a 16" PacNor piece of pipe.