Ok which polymer single stack 45acp out of the listed choices ? I like them both , they both shoot great and are built nice. Both are very thin and concealable. The only thing I question and can never get a concrete or confirmed answer on is the long strip of scallop shapes under the slide of the Shield 45 The area that strips the cartridges from the magazine. Anyone know ? The 9mm and .40 doesn't have this .