Colt

Colt M4/M4A1 Replacement Barrel Assembly 14.5in

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Colt M4/m4a1 Replacement Barrel Assembly 14.5in - Barrel for AR-15 - view 1
Colt M4/m4a1 Replacement Barrel Assembly 14.5in - Barrel for AR-15 - view 2
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Colt

Overview

The Colt M4/M4A1 Replacement Barrel Assembly features a 14.5-inch M4 profile, designed specifically for the 5.56 NATO caliber, making it a solid choice for a variety of tactical applications. With a carbine-length gas system and a twist rate of 1:7, this barrel optimizes stability and accuracy for a range of bullet weights, ensuring reliable performance in fast-paced shooting scenarios. This barrel assembly is commonly found in builds focused on tactical or home defense applications, where compactness and maneuverability are essential.

Specifications

MPNSP64669
FinishBlack
Gas System LengthCarbine
Twist Rate1:7
Barrel ProfileM4
Caliber5.56 NATO
Barrel Length14.5
CoatingNitride

Available Merchants(2)

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Brownells
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$319.99
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BattleHawk Armory
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$322.63
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Build history on GunPartPicker

Builders have added the Colt M4/M4A1 Replacement Barrel Assembly 14.5in to their builds on GunPartPicker. Since April 2026, it ranks #338 of the 1,046 barrels builders have added.

It was out of stock everywhere we track every time we checked in October 2026, and today none of the 2 retailers we track has it in stock right now. Listed prices start at $319.99 at Brownells for when it comes back.

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Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers

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Frequently Built With

The part most often added in each category by the builds that include this one

Harrington & Richardson BLEM "Slickside" Upper Receiver, Gray

Harrington & Richardson BLEM "Slickside" Upper Receiver, Gray

Upper Receiver$140in 20% of them
Midwest Industries 9.25" Quad Rail Combat T-Series Free Float Handguard, Black Anodized - MI-CRT9.5

Midwest Industries 9.25" Quad Rail Combat T-Series Free Float Handguard, Black Anodized - MI-CRT9.5

Handguard$156in 20% of them
Wilson Combat Extended AR-15 Charging Handle Latch - TR-CHR

Wilson Combat Extended AR-15 Charging Handle Latch - TR-CHR

Charging Handle$23in 20% of them
Wilson Combat AR-15 Lower Receiver Forged

Wilson Combat AR-15 Lower Receiver Forged

Lower Receiver$100 · out of stockin 20% of them
Aero Precision AR-15 5.56 BCG W/C158 Bolt - Aero Logo - Phosphate

Aero Precision AR-15 5.56 BCG W/C158 Bolt - Aero Logo - Phosphate

Bolt Carrier Group$149 · out of stockin 20% of them
Colt AR15A4 Trigger Guard Assembly

Colt AR15A4 Trigger Guard Assembly

Trigger Guardin 20% of them

Build Configuration Breakdown

Aggregated and anonymized data showing how builders use this product

Platform

91.7%
AR-1591.7%
AR-105.2%
AR-93.1%

Builds Featuring This Part

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Builds in the community that include the Colt M4/m4a1 Replacement Barrel Assembly 14.5in

BuildPartsTotal
second 5.56 build build
second 5.56 build		16$1214.60
SBR 14.5" 5.56 build
SBR 14.5" 5.56		23$2143.27

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