LMT MRP-L MLOK 11.5″ ‘Specwar’ Upper Receiver Chassis
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-L MLOK 11.5 ‘Specwar’ is designed for use with 12.5″ barrels, but can use barrels longer than 14.5″ in length. M-LOK compatible attachment points on all 8 sides. Barrel not included.


Rick (verified owner) –
The team at rooftop are incredible. Shipped fast and showed up mint
Geoffrey C. (verified owner) –
Of course Sol has the best BF sale prices. My wallet hurts but I’m happy. Lightning fast shipping and free ramen!
Fit and finish are great. Looking forward to running this bombproof upper in the apocalypse.
Miguel (verified owner) –
Finally got the upper I wanted at a great price a fast shipping. Highly recommended
William S. (verified owner) –
Been tinkering with a 13.9” pinned barrel for a while and this 100% is the perfect receiver for it balance wise if you’re running an lpvo.
Rooftop = best vendor online