Description
U.S. Army XM27 Power Cupola Ammunition-Lubricator Manifold Plunger, P/N 11619458
Item Overview
This U.S. Army plunger is an internal component of the ammunition-lubricator manifold assembly used in the XM27 powered 20mm gun cupola. The XM27 mounted the M139 20mm automatic cannon on the M114A1E1 armored command and reconnaissance carrier. Within lubricator manifold assembly P/N 11619463, this plunger worked with a spring and sealing packings as part of the equipment that supplied lubricant to the cannon’s ammunition-feed system. Army manual TM 9-1005-307-24P lists two plungers in each manifold assembly, making this a fully documented replacement part for the XM27 installation.
Identification and Features
The package stock number matches the parts listing in TM 9-1005-307-24P, dated March 1973. The manual records the component as “PLUNGER,” P/N 11619458, under Group 6007 for the lubricator manifold assembly. Figure 54 shows the plunger as item 5, positioned with a spring and packing components inside the manifold. Application code A assigns the part specifically to the XM27 power cupola. During operation, the plunger moved against spring pressure while the packings sealed the passage, helping the manifold manage lubricant within the ammunition-feed equipment.
- Official part name: Plunger
- Federal stock number: 1005-052-3787
- Part number: 11619458
- Parent assembly: Lubricator manifold assembly, P/N 11619463
- Quantity used per manifold: Two
- Application: XM27 powered 20mm gun cupola
- Associated weapon: M139 20mm automatic cannon
- Associated vehicle: M114A1E1 armored reconnaissance carrier
- Reference code: 19204
- Manual: TM 9-1005-307-24P, March 1973
- Parts group: Group 6007
- Illustration: Figure 54, item 5
Historical Background
The M114 family was developed during the early 1960s as a lightweight armored vehicle for command and reconnaissance duties. Early versions carried lighter machine-gun armament, while the M114A1E1 introduced the XM27 powered cupola and its M139 20mm automatic cannon. The cupola gave the operator powered control of the weapon and improved the vehicle’s firepower against ground targets and other battlefield threats. The M139 used linked 20mm ammunition delivered through a feed box and flexible chute. Its ammunition-lubrication equipment supported reliable movement of cartridges through this powered feed system, and the manifold containing this plunger formed part of that equipment. The M114 family served during the Vietnam era, while the 20mm-armed M114A1E1 reflected later Cold War efforts to improve the vehicle’s combat capability. The Army’s March 1973 repair-parts manual documented components such as this plunger so maintenance personnel could identify and replace individual parts instead of changing an entire manifold assembly.
Condition
This listing is for one plunger supplied with its marked military package. The package identification provides a direct match to FSN 1005-052-3787 and P/N 11619458 in the Army parts manual. The lubricator manifold, spring, packings, retainer, and other parts shown in Figure 54 are not included unless pictured with the item. Packaging condition, surface finish, and minor storage marks may vary among examples; consult the inventory photographs for the condition represented.
Ideal For
This identified XM27 component offers a compact and well-documented artifact from the M114A1E1’s 20mm armament system. Its original package number, confirmed part number, and illustrated manual location make it useful for restoration work, component research, museum interpretation, and displays explaining how the M139 ammunition-feed system was supported.
- XM27 cupola restoration projects
- M114A1E1 vehicle displays
- M139 cannon exhibits
- Military maintenance collections
- Vietnam-era vehicle collections
- Cold War ordnance displays
- Army repair-parts research
Approx length 1", Approx width 0.5", Approx height 0.25", Approx weight 0.1lbs.
Pictures are stock images of our inventory. Unless otherwise noted, you will not be receiving the exact item shown in the pictures. The pictures are representative of the item’s general condition. The item you receive might be slightly better, or worse, condition than was shown in the pictures. Unless otherwise stated when buying this item, all packages will be opened to check quality before shipping.
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