Gun Auctions


Listed By: CC Armory

Extremely Rare, All-Original US Property Marked GM Hydra-Matic M16A1 5.56mm Transferable Machine Gun

April 30, 2022, 1:42 p.m. - Unknown Section -
Listing Details

Transferable on a Form 3

Item Description

This Chester County Armory listing is for an extremely rare, factory original, musuem-grade US Property marked GM Hydra-Matic M16A1 5.56mm fully transferable machine gun. 

From 1968-1971, the Hydra-matic Division of the General Motors Corporation contributed significantly to the Vietnam wartime production of M16's for the US military, by using their tooling and production knowledge to manufacture approximately 469,217 M16A1's for delivery. Less than a handful of these rifles made it onto the NFA registry as fully transferable versions. 

This transferable machine gun is one of the few known examples available for civilian transfer. It is in excellent, museum-quality condition both mechanically and cosmetically, with only very minor handling marks noted on the exterior.  The internals show very limited wear markings, and is believed that this rifle has seen few, if any, rounds fired outside of any original testing. All parts are original to the weapon, including the GM manufactured bolt carrier group, with it's distinct "wave" pattern noted in the finish.

In addition to the US Property marking's on the receiver, it also proudly displays a white US Government acceptance stamp on the right side of the receiver. This stamp is in phenomenal condition, as well, with no detoriation exhibited outside of its original stamping, which is slightly less on the lower right side where it appears the stamp was not pressured as hard as the rest of the marker.

This rare model M16A1 also features SAFE, SEMI, and AUTO marked fire controls and a 20" barrel on the fixed A1 upper with the tear drop style forward assist. It also presents with original triangular handguards and its original A1 style buttsock and pistol grip. 

This NFA registered and fully transferable machine gun is currently available on a Form 3 for easy transfer. 

For more information on this listing, to purchase, 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

  • Publish date: April 30, 2022, 1:42 p.m.
  • Expiring Date: June 21, 2022, 12:46 p.m.

Seller Info

  • Shipping: Seller Will Ship!
  • Location: Pennsylvania
  • Listing ID: #10701

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