I recently purchased a new 10/22 and wanted to replace the factory sights with hiviz. Sounds easy enough use a brass punch and a hammer drive out the old sights and install the new ones. The only problem is I cant get the old ones out. I have been using a brass punch and substantial hammer with absolutely no luck. Im hitting the mess out of it too with the barrel firmly set in a vice. Any lube or way to freeze the front sight to make this easier?