I recommend to everyone to buy a complete Bushmaster lower half (only) from their dealer, and then order their upper seperately.  If you want, you can order just the stripped lower from your FFL and build the rest yourself.  But doing it this way allows you to order the upper (the important part) in any configuration you wish, with any options you wish.  Almost all factory configurations come with the needlessly heavy (but cheaper to produce) HBAR barrel profile, which I don't like.

Anyway, you may not save money by doing it this way vs. buying a factory configuration, but you'll get exactly the rifle you want the first time.

-Troy