I have a Remington 870 Pump 12 gauge and am getting ready to install the HIVIZ Tombuster II Sights to the vented rib barrel. Is there any way to determine if the front bead is threaded on the barrel or if it is press fit? Are there any suggestions to remove the bead without damage in case I want to re-install at a later date? I am no gunsmith but have rebuilt many antique autos and repair machinery on our farm all the time so I am familiar with most tools. Any help appreciated. Thanks...