I put night sights on my 40c. I know it's not a Shield but it should be the same. Both front and back drifted out pretty easy with a brass punch and plastic hammer. Same going back with the new sights. A padded bench vice makes all the difference in the world. You need to keep the slide well supported when drifting the sights. Oh, they go from left to right when looking from the back of the slide.
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AL
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