Not much need for customization when you can get one of these out of the box:

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Mossberg 500, 3" 12 ga, 20" barrel, fiber optic sights. I've done a disassembly, cleaned & polished the working surfaces and a good lube. I've cut a longer forcing cone and polished the barrel and installed a Star Dot choke.

I might switch to sturdier sights or even go with a red dot just to see what the fuss is about. Otherwise this gun is pretty much perfect for the way I hunt. IMO, if a turkey is too far away for a 2oz, 3" 12ga load, he's just too far away.