I just picked up a very nice blue/walnut(?) Defender 1300 (18.5") and am wondering if the XS Big Dot (epoxy over the bead) for the Remington 870 will work on it? If not, what are my other front sight options? I don't plan on doing much else to it except maybe putting a TacStar side saddle on. Any other suggestions for upgrades are welcome too. Thanks for any input.