MLKMWS monolithic upper receiver for large caliber rifle platforms. Created with M-LOK compatible attachment points on all 8 sides. Utilizes two locking lugs to secure/remove any larger caliber LMT barrel. This includes: 7.62×51 NATO, .243 Winchester, .260 Remington, 6.5 Creedmoor, 7mm-08 Remington, and .338 Federal. Barrel not included.