I'm not sure if the quest front sight is the same as the Storm XT's but if it is grab a block of wood and lightly tap the top of the site towards the breech. It will simply slide off after 2-3 taps. My Storm XT had absolutely no knurling at all it simply had a 20 degree milled flat spot at the end of the barrel where the front side slid onto with a slight press fit. There are mill marks from hogging the material off too fast but what do you expect with a gun made in China?