Unbagging a Colt M4A1 SOCOM barrel.

Shawn did an interesting accuracy test on a Colt 14.5 inch M4A1 SOCOM barreled upper of mine a little while ago.  His results can be read here.

Here is what a Colt M4A1 SOCOM barrel looks like new in the bag:

Colt M4A1 SOCOM barrel


Note the cardboard wick in the barrel.

Colt M4A1 SOCOM barrel


Colt M4A1 SOCOM barrelBarrel markings and F Front Sight Base (FSB) are clearly marked.

Colt M4A1 SOCOM barrel


This picture shows the yellow dot of paint found on new Colt barrels.  Also note the flats in the heavy barrel profile and notches in the handguard cap required for mounting a M203 grenade launcher.

Colt M4A1 SOCOM barrel


Colt AR15 barrels usually have a date stamp near the hand guard cap, this one is 06/11.

Colt M4A1 SOCOM barrel


The wick in the barrel extends past the chamber.

Colt M4A1 SOCOM barrel


While a new in package M4A1 SOCOM barrel comes with a complete FSB (front sight post included), no muzzle device or slip ring/delta ring are included.

Colt M4A1 SOCOM barrels can be found for sale from various sources.  These all are 14.5 inch barrels so it will need a permanently attached muzzle device to be legal on a non-NFA firearm.  The Colt 6920 SOCOM model comes with a similar barrel that is 16 inches in length and does not have the M203 flats milled into it.


6 thoughts on “Unbagging a Colt M4A1 SOCOM barrel.”

    1. No. You register a firearm as a SBR. That firearm will then need to be engraved by the manufacturer(person/trust/corp) that made it a SBR. That engraving can be on the receiver or barrel.

  1. The “wick” is a VCI (volatile corrosion inhibitor) rod, standard for military rifles and barrels that are packed for storage or shipment.

    Easier to clean up than a bore full of cosmoline, and no chance of plugging up the gas tube with grease.

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