In the 250PMO class a couple weeks ago, had a repeat student from a large west coast L/E special weapons team with a 2.0 CORE with a 4.25" Apex bbl. That combination flat out works, both function & accuracy.
Apparently, out of the nearly fifty cops there, half are using that combination. Going down the road of "the true test of another man's intelligence is how much he agrees with you" - I agree with the gentleman about the majority of the set-up.