Thanks for all the replies guys!!

I think BrushyHillGuide gave me the answer I was looking for... Honestly I didn't know what "single piece" meant either... His explanation of what they refer to as single piece makes it much clearer as to what they are and why the Precision builders use them.

This was a question I asked just to gain some knowledge on the differences between a true full custom rifle compared to my "budget" semi custom Savage builds.... I am in no way interested in looking at a Tempest or any other precision action out there. I am very happy with my Savage action rifles and have built a couple now that I'm quite proud of. I'm sure the rifles are capable of the 2''s and 3's that ya'll refer to, and I'm pretty sure the problem is "me behind the trigger"... that I can't get better results then the .5" groups I shoot. I'm just a country boy with a precision varminting addiction... not a comp shooter.

Thanks for the explanation Brushy Hill!