This Technical Manual Change 2 for TM 9-252 covers updates to the 40mm Automatic Gun M1, Antiaircraft Gun Carriage M2A1, and Gun Mount M3 manual originally issued May 1, 1952. Issued in January 1956, this change notice is a strong period piece for collectors of U.S. Army technical manuals, Korean War-era ordnance references, early Cold War military publications, antiaircraft artillery documentation, and dated government manual updates.
As a Change 2 update, this publication reflects the way U.S. Army technical literature was maintained, revised, and supplemented after initial issue. Manual changes like this were official working documents, intended to keep field and support references current for the equipment they covered. That makes this item especially useful for collectors, historians, researchers, archivists, restorers, and museums looking for authentic military reference material connected to 40mm antiaircraft gun systems and their support equipment.
The 40mm Automatic Gun M1, Antiaircraft Gun Carriage M2A1, and Gun Mount M3
The 40mm Automatic Gun M1 belongs to the broader family of U.S. military automatic cannon and antiaircraft artillery equipment. As identified by its nomenclature, it was associated with air-defense roles and ordnance-support systems, placing it within an important category of mid-20th-century military equipment.
The Antiaircraft Gun Carriage M2A1 and Gun Mount M3 are equally important parts of this manual’s subject matter. These components represent the carriage, mounting, and support side of the system, making this manual change relevant not only to the gun itself, but also to the equipment that helped define how the system was documented, supported, and maintained within the Army technical publication system.
For collectors, that gives this change notice added appeal. It documents a specific update to a major ordnance-related equipment group and fits especially well in collections focused on 40mm antiaircraft systems, Korean War-era manuals, early Cold War ordnance, U.S. Army technical publications, artillery support equipment, and military air-defense documentation.
What This Manual Change Covers
As Change 2 for TM 9-252, this publication served as an official update to the manual for the 40mm Automatic Gun M1, Antiaircraft Gun Carriage M2A1, and Gun Mount M3, originally issued May 1, 1952.
In practical terms, a manual change like this is especially relevant for:
That makes it useful not only as a collectible, but also as a practical historical reference for anyone studying how the U.S. military updated and maintained technical documentation for antiaircraft gun systems during the 1950s.
Historical Significance
The original manual issue date of May 1, 1952 places TM 9-252 in the Korean War / early Cold War period, while the January 1956 issue date of this Change 2 update shows how the manual continued to be revised after publication. Together, these dates reflect the continuing importance of standardized technical literature for major ordnance systems that remained part of U.S. military support planning after World War II.
During this period, the Army maintained extensive technical documentation for weapons, vehicles, artillery, carriages, mounts, support equipment, and maintenance systems. Manual changes like this are important because they show the ongoing life of a technical manual after its original release, preserving the update history behind the equipment and the official documentation system that supported it.
For collectors and historians, this manual change is especially relevant to subjects such as:
Because it relates to the 40mm Automatic Gun M1, M2A1 antiaircraft gun carriage, and M3 gun mount, this change notice adds strong historical depth to collections centered on U.S. air-defense systems, artillery support equipment, ordnance materiel, and military technical publications.
About This Manual Change
This listing is for Technical Manual Change 2 for TM 9-252, covering the 40mm Automatic Gun M1, Antiaircraft Gun Carriage M2A1, and Gun Mount M3 manual originally issued May 1, 1952. This Change 2 update was issued in January 1956.
It is especially well suited for:
Because manuals and manual changes were working documents, surviving examples are valued not only for their content, but also for their connection to real military documentation, inspection, maintenance support, revision history, and technical publication practice.
Why This Manual Change Matters
Many military manuals focus on rifles, vehicles, communications gear, or general shop equipment. This one documents a specialized and historically important subject: the official update history for the 40mm Automatic Gun M1 and its associated Antiaircraft Gun Carriage M2A1 and Gun Mount M3. That makes it especially useful for collectors who want to preserve the broader technical and logistical picture of U.S. Army air-defense equipment rather than only the weapons or vehicles themselves.
For collectors, it is a strong Korean War-era period piece with a focused antiaircraft ordnance subject. For researchers, it offers a useful reference point for U.S. Army technical manual revision history in the early Cold War period. For museums, it helps support displays that explain not only artillery systems, but also the official publications, updates, and support structure that kept military equipment documented and serviceable.
Ideal For
This manual change is a strong fit for:
Approx length 9", Approx width 6", Approx height .1", Approx weight .2lbs.
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