I need a new AR15 A3 upper receiver with a 16 inch, 1/9 twist heavy barrel, gas block with no front sight, and if possible a bolt and carrier. I will eventually be adding scope and rings as well. I have to trade a used A1 upper receiver with chrome bolt/carrier, 11.5inch/5.5 inch 1/9 twist barrel flash hider combo, Millet adjustable rear and Millet front sight, and a Century Arms R1A1 STG 58 FAL with a 18 inch barrel and muzzle brake. The FAL has about 300 rounds through it and dealer cost on it is about $550. The AR upper I bought with a rifle 10 years ago and never used it (Was a preban and needed a different upper configuration.), although it is used. Not sure how much the upper is worth. I need the new AR upper for duty-use. If you can help me, please reply either to this post or preferably email.