WTT my factory new 10.5 chrome-lined upper for a BCM M4 carbine upper with 14.5 M4 barrel and pinned flash hider. No BCG or charging handle. This is brand new, never shot. I was thinking about doing an SBR build but changed my mind. Purchase price is $490 + shipping if your outside of San Antonio. I'll also throw in a Phase 5 pistol buffer tube, a Magpul MIAD grip in FDE, and two Magpul windowed P-Mags in FDE as well. All NFA rules apply.