LWRCI DIR5B16ML DI 5.56MM BLK 16.1" 30+1 M-LOK, DIRECT, IMPINGEMENT, 223 Rem | 5.56 NATO $1865.
 
Trijicon, ACOG Rifle Scope, 4X32, Amber Center Illumination for M4A1, Flat Top Adapter, Backup Iron Sights and Dust Cover. $1347