LMTSLK8MRP – L 16 inch complete upper with Areo M4E1 lower. The LMT Monolithic Rail Platform (MRP™) is a true monolithic rail platform, milled from a single solid piece of aerospace aluminum forging. The true-free-floated design greatly improves accuracy. Single stage CMG dropped in trigger, radiant Raptor charging handle, swampfox scope, on a Wilson Combat mount. if you are familiar with LMT, then you know how expensive just the Upper alone is. SIX15 6FIVE3-3fourfive5. Can provide more pictures Upon request. My loss, your gain.