Ruger and the NRA had much to do with the 10 round getting buy. Ruger bc it was loosing a boat load of money to a newer company called Glock with high cap mags with the NRA it was a compromise.
"The best way to address the firepower concern is therefore not to try to outlaw or license many millions of older and perfectly legitimate firearms (which would be a licensing effort of staggering proportions) but to prohibit the possession of high capacity magazines.
"By a simple, complete and unequivocal ban on large capacity magazines, all the difficulty of defining 'assault rifle' and 'semi-automatic rifles' is eliminated. The large capacity magazine itself, separate or attached to the firearm, becomes the prohibited item.
"A single amendment to Federal firearms laws could effectively implement these objectives."
William B. Ruger
Sturm, Ruger Firearms
This letter was taken from the American Handgunner magazine, dated Sept 1992 page 18.