I just did this to my Sport. Adding a Vtac 15" rail. The taper pins on my Sport were reversed. You could tell just by looking at each side which was the side to start pounding on. I had to use a smaller hammer and really smack the h*** out of it. Just be careful and support the barrel and sight block to keep it from moving. I used some clean rags, a milled out 2x4 and more rags.