This is my first actual post. I had bought a glock 22 gen4 on march 28. All matching numbers. Well I recently traded for a glock 23gen4 it was bought new in December 2011. Well all the numbers match, even the case except the frame. Last digit is off by one number. The pistol is on papers as matching on case, barrel and slide not the frame. He claims the dealer had called glock and they told them it wasnt a big deal. That it's only off by one number. Should I be concerned On this matter? Everything was like new condition as well as my glock 22gen4. Any info would be greatly appreciated.