Listed By: CC Armory

US Property Marked Colt M231 FPW Firing Port Weapon 5.56mm NATO Transferable Machine Gun

Jan. 3, 2022, 4:18 p.m. - Unknown Section -
Listing Details

Transferable on a Form 3

Item Description

This Chester County Armory listing is for US Property marked Colt M231 FPW (Firing Port Weapon) 5.56mm NATO transferable machine gun.

The M231 was designed to attach and shoot from the firing ports on the M2 Bradley. This open-bolt redesign of the venerable M16 increases the firing rate of the weapon, dramatically, to approximately 1225 rounds per minute! 

This model features original US Property markings on the left side of the receiver at the magazine well. In a unique twist on the M16 family, Colt's manufacturing information is displayed on the right side of the receiver, due to the design of the SAFE/AUTO fire controls on the M231, which has a metal plate that blocks the left side of the receiver where Colt typically marks other weapons in the M16 family. This M231 also features a unique (to the M16 family) barrel that measures 15.6" in length.  The barrel is C MP CHROME BORE marked, as well. 

This rarely seen M231 FPW also sports an even more rare, Colt factory-produced collapsible wire stock, which was orginally created to allow the weapon to be deployed by a soldier outside of the M2 Bradley. Later versions of the M231 did not feature this ability, as after it's adoption and use, the military decided that the wire stock wasn't practical to maneuver inside an enclosed space when attached to the Bradley's firing ports.

This unique machine gun is in excellent mechanical condition, and, based on the limited markings and wear noted on the internals, appears to have been fired very little, if it all. Cosmetically, this weapon does note some handling marks in the exterior parkerization, consistent with a military weapon of its age (see photos). However, it does not note any deep scratches, dings, dents, gouges, cracks, etc, or anything that would be problematic to its physical operation.  

This US Property marked Colt M231 Firing Port Weapon chambered in 5.56mm NATO is a fully transferable machine gun, and it is currently on a Form 3 for easy transfer. 

We also currently have a large inventory of replacement parts for the M231 available, including bolts, springs, fire control groups, gas seals, etc.. We will include a small assortment of replacement parts and springs with the purchase of this machine gun. 

For more information on this listing or to view our other NFA and investment grade firearms, please visit our website at, or contact us via the information listed below.


Chester County Armory

West Chester, PA

email: [email protected]

phone: 610-235-6155

Extra Details

  • State Tax: $6.00
  • Publish date: Jan. 3, 2022, 4:18 p.m.
  • Expiring Date: Jan. 17, 2022, 4:18 p.m.

Seller Info

  • Shipping: Seller Will Ship!
  • Location: Pennsylvania
  • Listing ID: 76128583

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