Which Upper Receiver and parts kit?

[Quinc]

Decided to build myself an upper to go along with my lower. Searching for lowers brings up all kinds of info on lowers and lower parts kits, but I'm not having as good a luck searching for upper info. Looking for an A3/A4 flattop upper to use with a 24" WOA match barrel. Looking to shoot 600+ yards

Any recommendations on what to look for in a match upper receiver and parts?

Would this be ok?

http://www.midwayusa.com/viewProduct/default.aspx?productNumber=515637

or

http://www.bravocompanyusa.com/Upper-Receiver-assembly-M4-Flat-Top-p/flat%20top%20-upper%20-m4%202.htm

Also for the BCG should I go with a national match chrome one or do they really make a difference in accuracy?

http://www.midwayusa.com/viewProduct/default.aspx?productNumber=145426

[OHW]

Vltor MUR or POF, both top end billet. A Mega Machine is a close second.

[kemikalembalance]

There is gonna be alot of opinions here. IMHO, i have the bravo company 90 dollar uppers, work great. For a cheapy, i would go any other route. Bravo sells top notch stuff that works without all the gimmicks. To see the difference for myself, I have a complete Larue Tactical billet set and a Rainier Arms. Both feel great and both were expensive. And i dont see any difference other than visual and cost. ^^^ I have heard positive things about the VLTOR Mur, but have not shot one.
THe bolt group, doesnt make a difference in my rifles. I bought a Young Mfg. national match carrier group, stainless. And it cycles smoother, but then it might be a mental thing since i paid 100 dollars more than i probably needed to.

[Agent Tikki]

Vltor MUR or POF, both top end billet. A Mega Machine is a close second.

On a precision build with at big *** heavy barrel hanging off the front, is the only time these uppers are justified. They are stronger and heavier and will flex less, and be more consistent.

If you are getting a woa barrel, get the bolt from them too, I believe they will properly headspace it to your individual barrel.

[Don29palms]

On a precision build with at big *** heavy barrel hanging off the front, is the only time these uppers are justified. They are stronger and heavier and will flex less, and be more consistent.

If you are getting a woa barrel, get the bolt from them too, I believe they will properly headspace it to your individual barrel.

If you don't have a lower yet I would go with a matched billet upper/lower. There are quite a few companies that make them. Black Rain Ordnance, Mega Machine, Sun Devil and Loki Weapons Systems to name a few. Get a full auto BCG. I prefer chrome because it's easier to clean. Addax Enhanced chrome FA BCG is nice and they give discount to members.

[Uhhlexxxis]

By the time you get this assembled, you'll have the itch to buy another. Buy whatever parts you want now and you can always change them later. the AR15 platform is the barbie for men.

Some good brands you got there just budget (if you have to) and build it.

[gmcal]

Both of those uppers have M4 feedramps. Unless the WOA barrel extension has the M4 cuts it will cause feeding problems. Get an upper with the standard rifle feedramp.