The patented LMT Monolithic Rail Platform, MRP™ upper receiver. The receiver and handguard are made from a single piece of aerospace grade aluminum. The barrel is held in place with a proprietary locking system that utilizes two locking bolts accessible from the right side of the receiver. The only tool needed is a standard T-30 Torx bit to tighten the bolts. This receiver requires the patented LMT monolithic barrel assembly which has a low profile gas block with straight gas tube.

The MRP-H QUAD 12.75 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.

LM308BML1