Description
Own a sharp piece of Cold War and Vietnam War-era recoilless rifle history with this Technical Manual Change 2 for TM 9-1000-205-12. This change notice covers the 106mm M40A1/M40A1C recoilless rifles, the .50 Cal M8C spotting gun, the M79/M92 mounts, and the M27 tripod.
This is a Change 2 update for the original TM 9-1000-205-12, issued March 5, 1959. The original manual is listed as an operation and organizational maintenance publication for the Cal. .50 Spotting Rifle M8C, 106mm Rifles M40A1 and M40A1C, T173 and M79 rifle mounts, and tripod equipment.
Historical Significance
The M40A1/M40A1C 106mm recoilless rifle was one of the most recognizable U.S. anti-armor weapons of the Cold War. It was powerful, mobile, and adaptable to several field and vehicle-mounted setups.
One of the best collector details is the “106mm” designation. The M40 was commonly called 106mm, but its actual bore was 105mm. The 106mm name was used to avoid confusion with incompatible 105mm ammunition for the earlier M27 recoilless rifle.
This October 1965 Change 2 is especially interesting because it ties the system to later vehicle-mounted use. A collector reference notes that Change 2 dated October 13, 1965 added mounting information for the M79 mount in the M151A1C, while earlier documentation covered the M38A1C Jeep and M274 Mule-related mount updates.
That gives this manual change real “cool factor.” It connects the M40 recoilless rifle system to the Jeep, Mule, MUTT, tripod, and Vietnam-era mobile anti-tank world.
The M8C Spotting Gun Connection
The M8C spotting gun is one of the most fascinating parts of the M40 system. It was a .50 caliber self-loading spotting rifle mounted with the recoilless rifle. Its special 12.7x77mm cartridge was designed to match the trajectory of the 106mm round, giving crews a visual aiming reference before firing the main weapon.
For collectors, that makes this manual much more interesting than a standard weapon manual. It covers the full system: the recoilless rifle, the spotting gun, the mounts, and the tripod equipment.
What This Change Covers
As Change 2 for TM 9-1000-205-12, this publication updated the Army’s technical manual for the M40A1/M40A1C recoilless rifle system and related support equipment.
This manual change is especially relevant for:
- 106mm M40A1 and M40A1C recoilless rifle documentation
- .50 Cal M8C spotting gun reference
- M79 and M92 mount research
- M27 tripod reference
- M151A1C 106mm recoilless rifle vehicle displays
- M38A1C Jeep and M274 Mechanical Mule weapon-system collections
- Cold War and Vietnam War anti-armor research
- collectors completing a TM 9-1000-205-12 manual set
Key Features
- Technical Manual Change 2 for TM 9-1000-205-12
- Covers 106mm M40A1 and M40A1C recoilless rifles
- Covers the .50 Cal M8C spotting gun
- Covers M79 and M92 mounts
- Includes M27 tripod reference
- Dated October 1965
- Updates the original March 5, 1959 technical manual
- Strong Cold War / Vietnam War-era anti-tank weapon subject
- Excellent companion piece for a complete TM 9-1000-205-12 manual set
- Desirable reference for Jeep, Mule, MUTT, Ontos, and recoilless rifle collectors
Why This Collectible Stands Out
The M40 recoilless rifle system has strong collector appeal because it was used in several memorable configurations. It could be displayed on a tripod, vehicle mount, Jeep-type platform, Mechanical Mule, or as part of a larger recoilless rifle collection.
The M40A1C also has a strong connection to the Marine Corps M50 Ontos, one of the most recognizable recoilless-rifle vehicles of the Vietnam era. U.S. Army history describes the Ontos as a light, mobile anti-tank system fitted with six 106mm recoilless rifles, adopted by the Marine Corps, and used in Vietnam.
This change notice stands out because it documents the support details collectors care about: mounts, tripods, vehicle installations, and spotting equipment. It is a small publication with a big connection to Cold War direct-fire weapons.
About This Manual Change
This listing is for Technical Manual Change 2 for TM 9-1000-205-12, covering the 106mm M40A1/M40A1C recoilless rifles, .50 Cal M8C spotting gun, M79/M92 mounts, and M27 tripod, dated October 1965.
This listing is for the Change 2 update only unless otherwise stated. No complete base manual, recoilless rifle, spotting gun, mount, tripod, vehicle equipment, ammunition, tools, parts, storage case, or additional accessories are included unless specifically shown or noted.
Ideal For
This manual change is a strong fit for:
- Cold War U.S. Army technical manual collections
- M40A1 and M40A1C recoilless rifle reference libraries
- M8C spotting gun collectors
- M151A1C 106mm recoilless rifle displays
- M38A1C Jeep and M274 Mechanical Mule collections
- M50 Ontos and Vietnam War Marine Corps displays
- anti-tank weapon history collections
- museum and archival reference libraries
- collectors completing a TM 9-1000-205-12 manual set
Approx length 10", Approx width 8", Approx height .2", Approx weight .5lbs.
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