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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.
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.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
We ranked every barrel by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 Barrel Length & Brand Report →Check it against the live catalog:
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Aggregated and anonymized data showing how builders use this product
Builds in the community that include the Colt M4/m4a1 Replacement Barrel Assembly 14.5in
| Build | Parts | Total |
|---|---|---|
![]() | 16 | $1250.60 |
![]() | 23 | $2082.90 |
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