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HomeConversion

Conversion

Antiques

Musket to Big-Bore Rimfire: the Roberts Short-Frame Conversion

March 29, 2023 Ian McCollum 12

Brigadier General Benjamin Stone Roberts designed and patented a fall-block style of breech loading conversion to .58 Rimfire. Over the course of the decade after the Civil War, he was able to sell approximately 23,000 […]

Accessories

Austrian Troop Training: Erma EL-24 .22 Kit for the Steyr M95 Carbine

February 11, 2023 Ian McCollum 20

The German company Erma (Erfurter Maschinenfabrik) developed a .22 rimfire kit for the Mauser 98 for the German Army in the 1920s. It was used for training, both to allow for more effective fundamental practice […]

Conversion

From Aircraft to Improvised Infantry: the Vickers MkI No2

December 21, 2022 Ian McCollum 21

The Vickers MkI No2 was an improvisation of the British Royal Air Force. They needed arms for airbase defense, without unduly impacting the production of weapons for the infantry. Wheat they had a good supply […]

Accessories

The History of Drop-In Auto Sears

December 17, 2022 Ian McCollum 16

When Colt decided to sell a semiauto-only civilian version of its AR-15 rifle, it had to make a number of changes to the design of the lower receiver to prevent full-auto fire control parts from […]

Antiques

Older Gun With Newer Ammo: A Centerfire Winchester 1866

October 19, 2022 Ian McCollum 11

The Winchester 1866 was chambered for the .44 Henry rimfire cartridge, like the Henry rifle before it. Before too long, however, centerfire ammunition began to take over as the best and most common type of […]

Conversion

Evolving the Cheek Pistol Concept: Calico M950

October 15, 2022 Ian McCollum 35

I have found the “cheek pistol” concept form Rhett Neumayer at Demonstrated Concepts to be pretty interesting. When I was thinking about what pistol designs might be suitable for this sort of use, the Calico […]

bullpup

Croatia’s Prototype Bullpup AK Conversion

September 7, 2022 Ian McCollum 21

https://youtu.be/9LBz7Q7Nges The HS Produkt company, best known for making the XD pistols sold in the US by Springfield, was originally called IM Metal, and was a general fabrication company in Croatia. When the Croatian Homeland […]

Conversion

Arex AKB-15: A Lost AK Modernization Project

August 31, 2022 Ian McCollum 27

The AKB-15 was a project developed by Arex Defense in Slovenia in 2015. The company received a request from a small country (they decline to reveal exactly who) to modernize a stock of AKM rifles […]

Conversion

Two World Wars: A Weimar Police C96 Mauser

June 22, 2022 Ian McCollum 32

In the aftermath of World War One, German police forces were responsible for maintaining social order is a very chaotic Germany. They were reequipped with small arms, and in particular needed pistols. The ideal sidearm […]

Bolt Action Rifles

A .22LR Berthier for the French National Police (CRS)

June 15, 2022 Ian McCollum 17

In 1954, the Unique company (MAPF) in Hendaye France rebuilt a batch of 800 Berthier carbines into .22LR caliber for use by the Sûreté Nationale (later renamed the Police Nationale). These were to be used […]

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