Description
.50 Cal. Browning M2HB B9832 Oil Buffer Spring
Item Overview
This original-style .50 caliber M2HB oil buffer spring is a replacement component for the oil-buffer group of the Browning M2 machine gun. U.S. military manuals identify this part as Spring, Oil Buffer, part number B9832. It is a single mechanical spring rather than a complete oil-buffer assembly.
Identification and Features
The B9832 spring is a large coil spring fitted around the rear portion of the M2 oil-buffer assembly. Period Army maintenance manuals provide the part number, dimensions, and inspection standards needed to distinguish it from several other springs used in the weapon. Buyers should compare the part number and measurements with the requirements of their specific gun or restoration project.
- Official nomenclature: Spring, Oil Buffer
- Part number: B9832
- Weapon family: Browning Machine Gun, Cal. .50, M2
- Common application: M2 heavy-barrel, or M2HB, oil-buffer group
- Manual-specified free length: 6 inches with a tolerance of approximately .25 inch
- 1944 inspection standard: Minimum free length of approximately 5.5 inches
- Approximate coil count: 11.75 to 12.25 coils
- Quantity offered: One oil buffer spring
- Not included: Oil buffer, spring guide, guide key, receiver, or other gun parts
Oil Buffer Spring Function
The B9832 spring surrounds the rear section of the oil-buffer assembly and bears against the oil-buffer spring guide. It supplies spring resistance as the recoiling parts move and assists the assembly as it returns toward its normal position. The spring works as one part of the complete oil-buffer group and should not be described as a complete recoil system by itself. It is also different from the M2 driving spring, oil-buffer packing-gland spring, oil-buffer body spring lock, and smaller valve springs found elsewhere in the mechanism. Heavy-barrel M2 guns used a modified oil-buffer arrangement because their heavier barrels recoiled with less force than barrels used on some earlier M2 configurations.
Weapon Applications
The B9832 oil buffer spring is documented in wartime maintenance and parts publications for the Browning M2 .50 caliber machine-gun family. M2 heavy-barrel guns were produced in fixed, flexible, and turret-mounted forms. They were installed on ground tripods, armored vehicles, tanks, trucks, ships, and antiaircraft mounts. Ground crews commonly used flexible M2HB guns with the M3 and later M63 tripod mounts. Because individual M2 models and production periods may use different internal parts, compatibility should be confirmed before this spring is used in a mechanical restoration.
Historical Background
The Browning .50 caliber machine gun developed from John Browning’s work on a powerful large-caliber automatic weapon after World War I. The M2 family entered U.S. service during the early 1930s and used the .50 BMG, or 12.7x99mm, cartridge. The air-cooled M2 heavy-barrel model became one of the most recognized American machine guns of World War II. M2 guns later served during the Korean War, Vietnam War, Gulf War, Iraq War, Afghanistan War, and many other conflicts. They performed defensive, antiaircraft, anti-vehicle, and ground-support duties. Replaceable components such as the B9832 spring helped armorers maintain these guns during their exceptionally long service life.
Condition
This is a vintage military-surplus mechanical component. It may show scratches, finish wear, oxidation, storage residue, discoloration, minor surface pitting, loss of finish, or other signs of age and handling. Spring tension and suitability for installation have not been certified. Markings, finish, and minor manufacturing details may vary between examples. This listing is for one oil buffer spring only; the complete buffer assembly, guide, gun, mount, and accessories are not included. Please check the pictures for the general condition of the item.
Ideal For
This .50 caliber M2/HB oil buffer spring is a useful component for collectors, museums, armorers, and restorers studying the internal construction of the Browning M2. Its documented B9832 designation also makes it suitable for labeled parts displays and educational exhibits.
- Browning M2HB restoration projects
- .50 caliber machine-gun parts collections
- World War II weapons exhibits
- Military museum displays
- Armorer and maintenance displays
- Exploded M2 mechanism exhibits
- Historic vehicle restoration supplies
- Military surplus collections
Approx length 7", Approx width 1", Approx height 1", Approx weight lbs.
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.
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