MRP-L QUAD 5.56MM ASSEMBLED UPPER RECEIVER
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Lewis Machine & Tool
Overview
The MRP-L Quad 5.56mm Assembled Upper Receiver from Lewis Machine & Tool is a complete upper designed specifically for the AR-15 platform, chambered in the versatile 5.56 NATO caliber. This upper receiver offers a seamless integration of components, ensuring reliable performance and ease of installation for builders looking to enhance their rifle's capabilities. You will commonly find this upper in builds focused on 5.56 NATO specifications, making it a solid choice for a variety of applications.
Specifications
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Build history on GunPartPicker
Builders on GunPartPicker first added the Lewis Machine & Tool MRP-L QUAD 5.56MM ASSEMBLED UPPER RECEIVER to a build in February 2026.
Updated · from real builds on GunPartPicker
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