LMT Monolithic Upper Receiver - AR-10 - MRP-L - M-LOK - Rifle - 12.5"
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Lewis Machine & Tool
Overview
The LMT Monolithic Upper Receiver for the AR-10 platform features a complete assembly with a 12.5-inch barrel, offering a compact and robust setup ideal for various applications. The monolithic design provides enhanced rigidity and improved alignment for better accuracy, while the M-LOK attachment system allows for versatile accessory mounting. This upper receiver is commonly found in builds chambered in .223 Wylde, making it a solid choice for builders looking to maximize performance and compatibility.
Specifications
LMT Monolithic Upper Receiver - AR-10 - MRP-L - M-LOK - Rifle - 12.5"
Build history on GunPartPicker
Builders have been adding the LMT Monolithic Upper Receiver - AR-10 - MRP-L - M-LOK - Rifle - 12.5" to their builds on GunPartPicker since February 2026. All time, it ranks #461 of the 1,892 upper receivers builders have added.
Availability is good: it was in stock at one retailer or another nearly every day in October 2026, and today 2 of the 3 retailers we track have it in stock. The best price crept up from $1,181.70 to $1,300.99 over October 2026. Buying today, the lowest price is $1,181.70 at Primary Arms, which matches the best price we saw in October.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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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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