|Caliber||223 Remington/5.56 NATO|
|Sights||None, Optic Ready|
|Receiver Description||7075-T6 Aluminum M4|
- Yankee Hill (review by Shawn on 8/17/2015)
Its Yankee Hill..super nice stuff. The only thing I didn't take into consideration with this upper is that the left side is so thick that it wont accommodate a BAD lever. I made my own that fits, but the pocket is too tight for any of the normal Troy or MagPul parts to work.