LMT MRP-L 5.56 Quad Rail 14.5″ Midlength Complete Upper Receiver Group w/ Enhanced Bolt Carrier
A complete LMT factory-built and test-fired 14.5″ Midlength Upper Receiver Group.
This is a complete upper receiver group with 13.25″ Quad Rail receiver, 14.5″ Midlength barrel, ambidextrous charging handle, Enhanced M16 full-auto bolt carrier and standard bolt. These are brand new take-offs from complete LMT AR pistols and will show signs of being test fired.
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.
Specifications
- Caliber: 5.56mm
- Color: Black
- Upper Receiver: 13.25″ Quad Rail
- Bolt Carrier Group: LMT Enhanced M16 Full-Auto Bolt Carrier & Standard Bolt
- Rail: 13.25″ Quad Rail
- Barrel: 14.5″ LMT Chromed-Lined MRP Barrel, 1:7 Twist
- Gas System: Direct Gas-Impingement
- Charging Handle: LMT Ambidextrous
- Muzzle Device: A2 Birdcage
Due to the really expensive nature of this item, returns are not being accepted for these uppers. Please be sure that this is what you want. Thank you!




Matt C. (verified owner) –
Received in 2 days, flawless product, LMT > KAC, quad rail if you’re a man, Rooftop is an awesome company!
Austin T. (verified owner) –
This is a great upper at an ever greater price!!!!
Elmer M. (verified owner) –
Awesome upper! Got my order in 2 days. Five ⭐️ customer service. Gamsahabnida Rooftop Defense!
Jesse H. (verified owner) –
I have nothing but good to say about Rooftop defense shipping was quick product was even better when I got it than expected definitely worth every penny and I will buy from them again
T –
Without a doubt the best quad upper available anywhere. This thing turned my rifle form zero to hero in two take down pins.