Lewis Machine & Tool

Mrp-H M-LOK 7.62mm Assembled Upper Receiver - Mrp-H M-LOK 7.62mm 15.3" Assembled Upper Receiver

Lewis Machine & Tool Mrp-H M-Lok 7.62mm Assembled Upper Receiver - Mrp-H M-Lok 7.62mm 15.3'''' Assembled Upper Receiver - Upper Receiver for AR-15 - view 1
Lewis Machine & Tool Mrp-H M-Lok 7.62mm Assembled Upper Receiver - Mrp-H M-Lok 7.62mm 15.3'''' Assembled Upper Receiver - Upper Receiver for AR-15 - view 2
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Lewis Machine & Tool

Overview

The Mrp-H M-Lok 7.62mm Assembled Upper Receiver from Lewis Machine & Tool is a complete upper designed for the AR-10 platform, featuring a 15.3-inch barrel optimized for .308 Win caliber. This A4 receiver type offers a robust and reliable foundation for your build, making it suitable for various shooting applications. You’ll commonly find this upper in builds focused on .308 Win caliber, catering to those looking for enhanced performance at longer ranges.

Specifications

MPNLM308BML4A
Barrel Length15.3
PlatformAR-10
Caliber.308 Win
Receiver TypeA4
AssemblyComplete
Receiver PatternSR-25

Available Merchants(1)

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Brownells
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$1,414
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September 2026 on GunPartPicker

Lewis Machine & Tool Mrp-H M-LOK 7.62mm Assembled Upper Receiver - Mrp-H M-LOK 7.62mm 15.3" Assembled Upper Receiver ranked #117 of the 615 upper receivers builders added on GunPartPicker in September 2026. Builders have been adding it to their builds on GunPartPicker since February 2026. All time, it ranks #206 of the 1,713 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 the one retailer we track has it in stock. Prices barely moved in September 2026, holding around $1,413.90, so there haven't been real sales lately. Buying today, the lowest price is $1,413.90 at Brownells, which matches the best price we saw in September.

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Magazine Release$19in 13% of them
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Build Configuration Breakdown

Aggregated and anonymized data showing how builders use this product

Gas System

50.3%
Mid-Length50.3%
Carbine25.7%
Pistol11.4%
Rifle10.9%
Blowback1.3%
Other0.3%

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