Description
20mm Mark 4 Oerlikon Cleaning Rod Ejector Assembly
The 20mm Mark 4 Oerlikon Cleaning Rod Ejector Assembly, identified by P/N 367516PC2 / 367516-2, is a U.S. Navy gun-clearing accessory associated with the Mark 4 20mm Oerlikon antiaircraft gun. Its original federal stock number was FSN 1005-158-1690, later formatted as NSN 1005-00-158-1690.
This specialized tool worked with a separate cleaning-rod handle assembly. It is a gun-clearing accessory, not the internal ejector that removed spent cartridge cases during the gun's operating cycle.
Historical Significance
The U.S. Navy's 1943 OP 911 manual documented the Mark 2 and Mark 4 20mm Oerlikon antiaircraft gun mechanisms and their supporting tools. Figure 85 identified this exact accessory as the Cleaning Rod Ejector Assembly.
The tool formed part of the specialized support equipment developed for maintaining and clearing the Navy's 20mm Oerlikon guns. Later naval ordnance documentation retained the same part under the name Ejector, Cleaning Rod.
Cleaning-Rod Ejector vs. Internal Gun Ejector
The word ejector can refer to two different items in the Oerlikon system. The gun mechanism had an internal ejector associated with spent cartridge cases, while the 20mm Mark 4 Oerlikon Cleaning Rod Ejector Assembly was a separate tool used with the cleaning rod.
This distinction makes the assembly a gun-tool component rather than an operating component installed inside the weapon.
What This Item Is and Does
The 20mm Mark 4 Oerlikon Cleaning Rod Ejector Assembly attached to the separate cleaning-rod handle and was passed through the bore during gun-clearing work. Its purpose was to push a chambered projectile or live round rearward and out of the chamber.
The original manual lists 367516-2 as the Cleaning Rod Ejector Assembly. A later naval ordnance parts breakdown lists the same dash number as Ejector, Cleaning Rod, while federal logistics records associate P/N 367516PC2 with NSN 1005-00-158-1690.
Key Features
- Product: 20mm Mark 4 Oerlikon Cleaning Rod Ejector Assembly
- U.S. Navy part number: 367516PC2 / 367516-2
- Original stock number: FSN 1005-158-1690
- Later stock number: NSN 1005-00-158-1690
- 1943 manual nomenclature: Cleaning Rod Ejector Assembly
- Later naval parts nomenclature: Ejector, Cleaning Rod
- Associated weapon: U.S. Navy 20mm Oerlikon Mark 4 antiaircraft gun
- Item type: Separate gun-clearing tool component
Why This Item Matters
The 20mm Mark 4 Oerlikon Cleaning Rod Ejector Assembly represents the specialized maintenance and gun-clearing equipment developed for a U.S. Navy antiaircraft weapon of the World War II period.
Its documented part number, stock numbers, and clearly defined function make it useful for naval ordnance collections, museum exhibits, restoration reference, and technical study of the Oerlikon gun system.
About This Item
The offered item is identified as the 20mm Mark 4 Oerlikon Cleaning Rod Ejector Assembly, P/N 367516PC2 / 367516-2. The listed stock-number sequence is FSN 1005-158-1690, later written in modern NSN format as 1005-00-158-1690.
The assembly was designed to connect to a separate cleaning-rod handle. It should not be confused with the Oerlikon gun's internal cartridge-case ejector.
All items are opened from the original packaging to verify its condition before shipment. If your prefer to receive an item in its original, unopened packaging, please indicate your request in the order comments at checkout. Please Note: If you request an item in its original, unopened packaging, we are unable to verify the item's condition prior to shipment.
Ideal For
This item is a strong fit for:
- U.S. Navy ordnance collections
- World War II naval antiaircraft displays
- 20mm Oerlikon Mark 4 gun-accessory exhibits
- Military museum and educational collections
- Historic naval-gun restoration reference
- Film, theater, and period prop departments
Approx length 9.5", Approx width .75", Approx height .75", Approx weight .5lbs.
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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