First you need to check to see if this is the issue. remove your slide, remove the barrel, install the barrel without the slide. Use the slide stop to hold the barrel in the frame. You will need a light that you can shine into the frame and see if the barrel kidney is past the frame where the guide rod would sit. With the barrel pushed fully forward and looking from the muzzle end under the barrel and above the frame you can see the guide rod seat. if the kidney is past the seat you will need to trim the kidney. You kind of need 3 1/2 hands. If you have a way to hold the frame muzzle up you can also use the guide rod to see how much the barrel pushes the guide rod away from the frame. Take the guide rod and hold it in the frame and when you move the barrel you will feel it push the guide rod.