You'll do way better breaking it down. Sell optics and Surefire seperately. You'll move the upper and lower much faster if sold seperately.
You'll do even better by putting the upper back into original condition and selling the LaRue seperately as well.
Sell off the Troy sights, Tango Down VFG, sling, etc...seperately as well.
You lose money selling them with the upper and by reducing the price you need to charge for the upper, will probably move it faster in these tougher economic times, especially just before Xmas.
It would also help for you to use paragraphs in your listing, instead of having all the text run together.
Post full size pics and more of them. For the poor unfortunates still on dial-up, they will PM or E-mail if they're seriously in the market.