Used Palmetto Spacewalker lower with a 16" .300Blk upper.  Has Talon Safeties and Radian Raptor charging handle, Troy BAD lever, Troy Ambi Mag Release, and a set of Magpul Flip-Up Sights.

Available here: https://thewichitagunclub.com/product/used-palmetto-300blk-ar-15/