Lewis Machine & Tool

LMT Mrp 5.56 NATO Chrome Lined Piston AR-15 Barrel - 12"

All Lewis Machine & Tool barrels
Lewis Machine & Tool Lmt Mrp 5.56 Nato Chrome Lined Piston Ar-15 Barrel - 12" - Barrel for AR-15 - view 1
Lewis Machine & Tool Lmt Mrp 5.56 Nato Chrome Lined Piston Ar-15 Barrel - 12" - Barrel for AR-15 - view 2
Lewis Machine & Tool Lmt Mrp 5.56 Nato Chrome Lined Piston Ar-15 Barrel - 12" - Barrel for AR-15 - view 3
Lewis Machine & Tool Lmt Mrp 5.56 Nato Chrome Lined Piston Ar-15 Barrel - 12" - Barrel for AR-15 - view 4
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Lewis Machine & Tool

Overview

The LMT MRP 5.56 NATO Chrome Lined Piston AR-15 Barrel is a 12" barrel designed for precision and reliability, featuring a 1:7 twist rate that stabilizes a wide range of bullet weights for improved accuracy. The carbine-length gas system ensures consistent cycling and performance, while the 1/2x28 thread pitch allows for standard muzzle device compatibility. This barrel is often utilized in compact and tactical builds where maneuverability and performance are key.

Specifications

MPNL7MC1B
Gas System LengthCarbine
CoatingManganese Phosphate
Thread Pitch1/2x28
Caliber5.56 NATO
Twist Rate1:7
Barrel Length16

Available Merchants(2)

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Primary Arms
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$717
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BattleHawk Armory
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$717
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Build history on GunPartPicker

Builders have been adding the LMT Mrp 5.56 NATO Chrome Lined Piston AR-15 Barrel - 12" to their builds on GunPartPicker since April 2026. All time, it ranks #392 of the 839 barrels builders have added.

It was in stock most days in September 2026, and today only Primary Arms has it in stock. Prices barely moved in September 2026, holding around $716.85, so there haven't been real sales lately. Buying today, the lowest price is $716.85 at Primary Arms, which matches the best price we saw in September.

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