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Colt M4/M4A1 Replacement Barrel Assembly 14.5in

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)

Prices checked

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Brownells
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$320
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BattleHawk Armory
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$323
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Build history on GunPartPicker

Builders have been adding the Colt M4/M4A1 Replacement Barrel Assembly 14.5in to their builds on GunPartPicker since March 2026. All time, it ranks #241 of the 814 barrels builders have added.

It was out of stock everywhere we track for all of August 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 35 retailers

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Frequently Built With

The part most often added in each category by the 5 builds that include this one

Harrington & Richardson BLEM "Slickside" Upper Receiver, Gray

Harrington & Richardson BLEM "Slickside" Upper Receiver, Gray

Upper Receiver$140 · out of stockin 1 build
Wilson Combat AR-15 Lower Receiver Forged

Wilson Combat AR-15 Lower Receiver Forged

Lower Receiver$52in 1 build
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 1 build
Wilson Combat Extended AR-15 Charging Handle Latch - TR-CHR

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

Charging Handle$23in 1 build
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$165in 1 build
Colt AR15A4 Bolt Catch

Colt AR15A4 Bolt Catch

Bolt Catchin 1 build

Build Configuration Breakdown

Aggregated and anonymized data showing how builders use this product

Platform

88.8%
AR-1588.8%
AR-108.4%
AR-92.8%

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$1250.60
SBR 14.5" 5.56 build
SBR 14.5" 5.56		23$2082.90

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