I have a basic field model 500A, 18-1/2" cylinder bore barrel, that runs great. Shoots whatever I run through it. It's never used for hunting, but for shooting recreational clay and for home defense. Fortunately, its second use has never come to fruition, but that's what it's for. It's got the standard wood/fake wood forend, standard wood stock, and single bead front sight. Basic 500A that you can buy from Walmart or Sports Authority or wherever else. It's probably 15 years old now. I'd like to spruce it up. I'd like to replace the furniture with black synthetic. The smooth wood forend isn't all that "tacky" with wet or sweaty hands. I'd also like to have a light on it and possibly some inexpensive-but-improved sights (like some fiber optics). I'm not into scopes on shotguns. I can find the sights fairly easily, but I'm curious about the others. 1. I understand that barrels interchanged within the 500 series; do all 500 series forends interchange as well? I've seen some designed for all, and some say they're for the 590/590A1. 2. I've seen forends integrated with lights, but they're quite expensive. I've also seen lights that ride side saddle next to the barrel. Anyone have any recommendations here? 3. Not specific to the 500A here, but does anyone have a favorite shotgun sling and a carrier system for extra rounds?