LMT Monolithic Upper Receiver - AR-15 - MRP-L - Quad-Rail - Rifle - 13.25"
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Lewis Machine & Tool
Overview
The LMT Monolithic Upper Receiver is a complete assembly designed for the AR-15 platform, featuring a 13.25-inch barrel length. This upper receiver integrates the handguard into a single piece with the upper, which enhances rigidity and simplifies installation, ensuring a solid mount for optics and accessories. It's commonly utilized in builds chambered for 5.56 NATO, making it a popular choice for those looking to create a lightweight and versatile rifle setup.
Specifications
LMT Monolithic Upper Receiver - AR-15 - MRP-L - Quad-Rail - Rifle - 13.25"
Available Merchants(4)
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Build history on GunPartPicker
Builders have been adding the LMT Monolithic Upper Receiver - AR-15 - MRP-L - Quad-Rail - Rifle - 13.25" to their builds on GunPartPicker since March 2026. All time, it ranks #917 of the 1,654 upper receivers builders have added.
Availability is good: it was in stock at one retailer or another nearly every day in September 2026, and today 2 of the 4 retailers we track have it in stock. It dipped to $758.99 at KY Gun Company for a stretch in September 2026, well under its usual $940.50, so sales do come around. Buying today, the lowest price is $940.50 at Brownells, above September's low of $758.99, so a better deal may come back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
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Frequently Built With
The part most often added in each category by the builds that include this one
LMT MARS-L Ambidextrous AR-15 Stripped Lower Receiver
Geissele Automatics Super Semi-Automatic Enhanced SSA-E Two Stage AR-15 Trigger
Geissele Automatics AR-15 Maritime Bolt Catch Steel Black
LMT Full-Auto 5.56 Enhanced AR-15 Bolt Carrier Group
LMT AR-15 Carbine Buffer Tube
Geissele Automatics Ultra Duty Magazine Release Button
Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
CaliberBased on real build data showing which calibers builders choose alongside this product.
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
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