LMT MRP 13.25″ Quad Rail Monolithic Upper Receiver W/ LMT 14.5″ Barrel | Lewis Machine & Tool


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This is a complete upper MINUS BCG & CH.

A BCG and charging handle are NOT included.

Barrel is CARBINE gas system

(2 customer reviews)

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The patented 13.25″ LMT monolithic rail platform upper receiver. The receiver and handguard are made from a single piece of forged aerospace 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 (included).

The MRP is the rifle length receiver designed for 14.5″ barrels up to 20″ barrels with quad rail at the 3, 6, and 9 o’clock positions.  This receiver sports 5 QD sling swivel attachment locations.

  • 14.5″ Length
  • Chrome Lined
  • 1/7″ RH Twist
  • Carbine Gas System
  • 5.56 NATO / .223
  • Low Profile Gas Block
  • Straight Gas Tube
  • A2 Flash Hider

Designed for the LMT monolithic receiver, this barrel utilizes a low profile gas block, carbine length straight gas tube, and A2 birdcage for reduced flash. The barrel is coated and cryogenically treated for long term durability.

Additional information

Weight 113 oz
Dimensions 14 × 4 × 6 in

2 reviews for LMT MRP 13.25″ Quad Rail Monolithic Upper Receiver W/ LMT 14.5″ Barrel | Lewis Machine & Tool

  1. Andrew Ha (verified owner)

    Barrel was easy to install. The quad rail is a tank but is overall a good size for me. Love the look of it. Finish is great and there were no blemishes everyone likes to joke about. I paired it with the LMT CH and SA BCG and it ran flawlessly

  2. dsimm78 (verified owner)

    It was easy to order, shipped fast and has perfomed better than i expected. Its cycles smoothly and the qc is spot on.

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