I've decided that I want a longer upper (20+ inch stainless heavy barrel). Google was little help. What should a fair asking price be for my 16-inch (200 actual rounds downrange, normal handling wear, meticulous cleaning, if that matters, ha!), NO rear sights, no BCG, and no CH go for? Does $175-200 sound fair or not? All input appreciated and thank you! Wanna kill these ads? We can help!