I ordered an Action with a 3 to 4" pin.  The one that came in had a 1/2" pin.  I generally put the pin under my ring finger and place the cg slightly right.  What difference in reaction will I see with a 1/2" pin versus a longer pin out?  Thanks for the help....JS

1/2" pin?? John, John, John ...
(Can't you ask them toget you a 2-3" pin at least, if you plan on your normal drilling?)

Being as strong as the Action is, normally, I suspect on the lanes you've been bowling on, it will go thru the skid/hook/roll cycle fairly quickly. It'll have,in general, a little less continuation after hooking and won't have quite as much POTENTIAL backend as a longer pin-CG distance. A light polishing may modify some of that and make it more useful.
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"...for advice is a dangerous gift, even from the wise to the wise...."
J. R. R. Tolkien

try a 1.30 label drill with pin out past and below the ringer finger..should gave you more length and good back end..
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Shake a leg boy, but don't bend the knee!

Rab C Nesbitt

I know a guy on my Teusday night leauge whos a 500RPM+ rev player, lots of ball speed, nearly 21MPH strike shot. All of his equipment is Pin to CG less then 1". Hes got a Roto Grip Sonic Boom with a pin to CG placement of less then 1/8th inch, its almost literally stacked pin and CG. Very much a pin placement youd see with a true plastic ball. He averages 227 so i guess it works for him lol.