Mrp-L M-LOK 5.56mm Assembled Upper Receiver - Mrp-L M-LOK 5.56/300 Black 7.3'''' Assembled Upper Receiver
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Lewis Machine & Tool
Overview
The Lewis Machine & Tool MRP-L M-Lok 5.56mm Assembled Upper Receiver is a complete upper designed for AR-15 platforms, featuring a 7.3-inch barrel optimized for 5.56 NATO ammunition. This configuration provides a compact setup ideal for close-quarters engagements while maintaining compatibility with a variety of muzzle devices and accessories thanks to its M-Lok attachment system. Builders often use this upper receiver in short-barreled rifle setups where maneuverability and weight savings are crucial.
Specifications
Mrp-L M-LOK 5.56mm Assembled Upper Receiver - Mrp-L M-LOK 5.56/300 Black 7.3'''' Assembled Upper Receiver
Build history on GunPartPicker
Builders on GunPartPicker first added the Lewis Machine & Tool Mrp-L M-LOK 5.56mm Assembled Upper Receiver - Mrp-L M-LOK 5.56/300 Black 7.3'''' Assembled Upper Receiver to a build in July 2026.
Availability is good: it was in stock at one retailer or another nearly every day in September 2026, and today 2 of the 3 retailers we track have it in stock. It dipped to $696.99 at KY Gun Company for a stretch in September 2026, well under its usual $890.10, so sales do come around. Buying today, the lowest price is $890.10 at Brownells, above September's low of $696.99, so a better deal may come back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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