Thanks to AR15.com I have built 4 AR15's.  I'm ready for number five, but with a 3 month old baby, I'm gonna have to sell one to buy one (A concept which is new to me, I have never sold one of my firearms).  So, my least favorite AR I built on a Forged Olympic lower with a parts kit from Gunsmoke.  16" Flat-top upper, STD stock. Bushmaster lower parts, but not sure of the upper or barrel parts (no chrome lining)and a DPMS detachable carry handle w/ A2 Sights.  How much would be a fair selling price?  Excellent shape, perhaps 500 rounds have been run through it.  Sure I know how much I have in it, but I hope to draw on your experiences so I don't get burned.  What if I sold it w/o the carry handle?   Thanks!