does anyone make aluminum oval-shaped ( kinda like the carbon 15 ) freefloat handguards for a full length ar15?  also, where can i get the best price on a full lenght 4 rail freefloat handguard, and gas block?  and last but not least, where can i get the best deal on a m4 carbine upper?  thanks for any help!  

1.  I have never seen such an animal,  but that does not mean it does not exist out there in the vast AR15 aftermarket.

2.  The nicest full length 4-rail handguard just so happens to be the cheapest as well, the Oly FIRSH.  

3,  M4 uppers are ubiquitous, but if you want quality, stick with the ABC's:  Armalite, Bushmaster, Colt.  When you go cheap, you often time get exactly what you pay for when it comes to firearms.

Quoted: 2.  The nicest full length 4-rail handguard just so happens to be the cheapest as well, the Oly FIRSH.

You have to be kidding right?  Have you ever seen a KAC FF RAS in person?  Every non gun person I show it to and explain it to comments on how well its constructed.

Oly Firsh is nicer than a KAC FF RAS... better value for you money?  OK that I will buy but it is NOT better built or nicer looking.