If you are interested, I have this AAC upper with KAC URX Rail for a sub $1000 300BLK:
I also have a couple 16" CMMG 300BLK with Stainless Steel Barrel and FSB coming soon (Pricing to be determined, but definitely sub 1k)
If you want to splurge, I have a 14.5" Noveske with pinned AAC Blackout Flash Hider and Stainless Barrel @ $1325
Otherwise, any of the brands mentioned in this thread by others should do just fine.
another option is to use the Templar Custom FastRail, which will allow you to swap between 5.56 and 300 BLK with a quick barrel swap.
Both barrels will need to use low-profile gas blocks and the proprietary barrel nuts (one is included with the rail).
Money saver tip: look at my signature below
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