New bushing COULD be the fix. Accurately measure the inside of your slide bore and the outside of your barrel. Now measure the corresponding surfaces on your bushing. Report back here what you get. You can sometimes find a bushing in Brownells that will come very close to your barrel/slide measurements. Opinions differ, but I like a zero clearance light press fit (finger pressure only) of bushing to slide with about half a thou clearance to the barrel on a carry gun. Also check for movement of the barrel hood at lockup by pressing down on the hood. It shouldn't move very much if any. No movement is best. Group Grippers are iffy at best in my book. Some work, some cause malfunctions.