Vietnam War 20mm Mk-68 Gun Mount "Brown Water Navy" Fast Patrol Boat (PTF Nasty) - SPEEDRUN ASSEMBLY

This video details the assembly process for the 20mm Mark 16 Autocannon on a Mark 68 Mod 1 Gun Mount. It covers barrel mounting, ammunition feed system installation, and demonstrates the manual controls for traverse and elevation. The content suggests a high level of technical expertise in weapon systems.

This video from AT3 Tactical explores the function and necessity of the forward assist on AR-15 style firearms. It delves into the component's historical origins, specifically its introduction during the Vietnam War era, and examines its practical applications and potential drawbacks on modern rifles. The content aims to educate viewers, whether they are new to building or modifying AR-15s, to make an informed decision about the forward assist's role in their firearm setup. The video also touches on specific drills and potential problems associated with the component.

This video documents the meticulous process of restoring a WW2 Oerlikon 20mm anti-aircraft cannon. Starting from a collection of disparate parts, the restoration team works to bring this historically significant weapon back to museum-quality condition. The title emphasizes the iconic nature of the Oerlikon and its historical context within naval warfare during World War II.

This video details the precise installation of two 20mm smoothbore barrels into a Mark-11 dual-barrel autocannon receiver, a system utilized by US Navy jet fighters. It highlights the robust construction and the critical alignment and locking procedures required for this heavy ordnance.

This video details the removal of a unique rifled insert from a 20mm Mark-11 Autocannon revolver cylinder. These short, rifled inserts impart spin to projectiles before they enter the weapon's smoothbore main barrel, a distinctive design feature for this naval autocannon. The process showcases specialized tools and expert knowledge of rare military firearms.

This video demonstrates the functionality of an M4 20mm ammunition linker and delinker. The device is designed to process up to 12 rounds of 20x110mm Hispano-Suiza ammunition at once. The description also notes that the item is available for purchase on Ordnance.com, indicating a potential sales or product showcase element.

This review covers the Finnish L-39 Lahti, a formidable 20mm anti-materiel rifle nicknamed 'Norsupyssy' or Elephant Gun. It highlights the rifle's massive scale, unique ski-style bipod, and the challenging process of loading its 10-round magazine with 20x138mmB Solothurn cartridges. The demonstration showcases the rifle's powerful live fire, emphasizing its significant muzzle blast and recoil.

This video showcases a 127-year-old U.S. Army 3.2-inch Model 1897 Field Gun, highlighting its historical significance and operational mechanics. Key details include its 1898 Watervliet Arsenal manufacture and a live-fire demonstration revealing its recoil and smoke characteristics. The content emphasizes the historical context and engineering of vintage artillery.

This video unboxes a sealed 'spam can' containing 25 inert 20mm M18A3 drill cartridges manufactured in March 1950. The presenter demonstrates opening the vintage container using its integrated key and inspects a cartridge, noting its headstamp. The can's interior includes a warning against food storage.

This video demonstrates the live fire of a Soviet 82mm mortar, showcasing its loading and firing mechanism. The footage highlights the round's impact and subsequent detonation, emphasizing the destructive power of this indirect fire support weapon. The operator's safe handling and the controlled environment suggest a high level of expertise.