Colt 14.5" M4A1 SOCOM Barrel with FSB — CAGE Code | The Standard for Block 1 and Block 2 Clone Builds
This is the barrel. Not a "mil-spec compatible" approximation, not a SOCOM-profile clone — the actual Colt 14.5-inch M4A1 SOCOM barrel with front sight base, bearing the CAGE code that confirms its government contract provenance. If you are building a correct M4A1 Block 1 or Block 2 clone, this barrel is the centerpiece.
Why the SOCOM Profile Matters
The SOCOM barrel profile is not a marketing designation — it is a specific government-contract specification developed to optimize the M4A1 for the demands of special operations use. Heavier than a standard government profile under the handguard, it manages heat during sustained fire. The 14.5" length keeps the carbine maneuverable in close quarters while maintaining ballistic performance. The FSB (front sight base) is integral to Block 1 configurations and remains standard for Block 2 with the correct rail installed over it.
The CAGE code stamped on this barrel is the proof. It tells you this barrel was produced under government contract, to government specification, by Colt. Charlie's has been sourcing genuine CAGE-coded Colt components for M4A1 clone builds since 2017 — these are not easy to find, and when we have them, they go.
Block 1 vs. Block 2 Context
Block 1 M4A1 builds pair this barrel with a KAC RAS rail, AN/PEQ-2, and Aimpoint M68 CCO. Block 2 builds use this barrel with a Daniel Defense M4A1 RIS-II, AN/PEQ-15, and Aimpoint M4 or EOTech. In both cases, this barrel is the correct foundation.
What You Should Know Before Buying
14.5" barrel requires a pinned and welded muzzle device to achieve legal 16" OAL for non-NFA use, or a Form 1/Form 4 for SBR. Ships as a non-serialized part — no FFL required for the barrel alone. Confirm threading with CCC; standard M4 is 1/2×28.
Complete Your M4A1 Build
→ M4A1 SOPMOD Block 2 Complete Upper
→ KAC Free Float RAS (Block 1 rail)
Further Reading
→ Colt M4A1 Evolution — American Rifleman
For clone builders chasing Block 1 or Block 2 correctness, CCC is the resource. We've been doing this since 2017 — the team knows exactly what you need and what's correct.
