Lewis Machine & Tool

LMT 5.56 Chrome Lined M4 AR-15 Barrel With A2 FSB - 10.5"

All Lewis Machine & Tool barrels
Lewis Machine & Tool Lmt 5.56 Chrome Lined M4 Ar-15 Barrel With A2 Fsb - 10.5" - Barrel for AR-15 - view 1
Lewis Machine & Tool Lmt 5.56 Chrome Lined M4 Ar-15 Barrel With A2 Fsb - 10.5" - Barrel for AR-15 - view 2
Lewis Machine & Tool Lmt 5.56 Chrome Lined M4 Ar-15 Barrel With A2 Fsb - 10.5" - Barrel for AR-15 - view 3
Lewis Machine & Tool Lmt 5.56 Chrome Lined M4 Ar-15 Barrel With A2 Fsb - 10.5" - Barrel for AR-15 - view 4
Lewis Machine & Tool Lmt 5.56 Chrome Lined M4 Ar-15 Barrel With A2 Fsb - 10.5" - Barrel for AR-15 - view 5
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Lewis Machine & Tool

Overview

The LMT 5.56 Chrome Lined M4 AR-15 Barrel is a compact 10.5-inch barrel designed for optimal performance in short-barreled rifles. With a 1:7 twist rate, this barrel stabilizes heavier projectiles, making it well-suited for a range of ammunition types. The carbine-length gas system enhances reliability and reduces recoil, while the Manganese Phosphate coating provides added durability. This barrel is commonly found in builds focused on CQB (Close Quarters Battle) applications, where maneuverability and quick handling are essential.

Specifications

MPNLMP10408
CoatingChrome Lined
Barrel Length10.5
Barrel ProfileM4
Caliber5.56 NATO
Gas System LengthCarbine
Thread Pitch1/2x28
Twist Rate1:7

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$452
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September 2026 on GunPartPicker

LMT 5.56 Chrome Lined M4 AR-15 Barrel With A2 FSB - 10.5" ranked #77 of the 250 barrels builders added on GunPartPicker in September 2026. Builders have been adding it to their builds on GunPartPicker since January 2026. All time, it ranks #259 of the 839 barrels 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 $451.80, so there haven't been real sales lately. Buying today, the lowest price is $451.80 at Primary Arms, which matches the best price we saw in September.

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