For sale is a New
Micro upper (7.5" barrel) in 5.56x45. It has the new upper design (non-grooved rails) and new gas system.
Conversion kits (barrel, bolt, & mag) run $550. Stripped uppers run $400. Add in the small parts and carrier group, which would total over $100 more.
I'm asking a flat $1000 + shipping. Near Reading, PA for FTF.