Osorio Selectiva: A Nicaraguan .22 Rimfire Machine Pistol

This guide details the disassembly and comparison of the rare Steyr M1912/16 'Repetierpistole,' a full-automatic variant of the Steyr Hahn M12. It highlights key external and internal differences required for full-auto fire, including the selector lever, extended magazine, and complex linkage system. The information is presented with high authority by Ian McCollum, an expert in historical firearms, based on access to museum collections.

This guide details the mechanics of the vz. 61 Skorpion machine pistol, focusing on its closed-bolt, hammer-fired operation and the unique inertial rate reducer located in the grip. Expert Ian McCollum highlights the sophisticated engineering behind this Czechoslovakian firearm.

This guide details the technical differences and legal considerations for converting semi-automatic Uzis into registered machine guns, focusing on the 'Registered Bolt' versus 'Registered Receiver' methods. Expert Ian McCollum explains that registered receiver conversions offer greater flexibility and compatibility with standard parts, aligning closer to the original military design. Proper understanding of NFA regulations and precise gunsmithing are crucial for legal and functional conversions.

This guide details the disassembly and internal comparison of the Beistigui Hermanos MM31 machine pistol, a Spanish variant of the Mauser C96. It covers safety checks, identification of markings, and highlights key internal differences like the pinned locking block, as presented by firearms expert Ian McCollum. This advanced procedure is crucial for understanding the nuances of this historical firearm.

This guide details the field stripping process for the Beretta 951A machine pistol and provides an overview of its fire control mechanism. It highlights the pistol's wedge locking system and the modifications made for full-auto capability. The information is presented with the analytical and historical depth expected from an expert like Ian McCollum.

This guide details the operational aspects of the Beretta 951A machine pistol, focusing on its select-fire capability, the function of its wooden front grip, and modifications made for legal compliance. It highlights how the sear engagement and increased mass of moving parts influence its firing rate and behavior in automatic mode, based on expert analysis.

This guide details the specific technique for separating two MAS-36 rifles that have been inadvertently locked together by their bayonets. It outlines the historical context of this issue, the modification made to the bayonet to resolve it, and the step-by-step procedure for disengagement. The technique requires precise alignment and the use of a pointed tool to access the internal release mechanism, as demonstrated by firearms expert Ian McCollum.

This guide details the loading and firing procedure for the M134 Minigun, as explained by Ian McCollum. It covers manual indexing of the barrel cluster, feeding the ammunition belt, engaging controls, and firing. The guide also touches upon the weapon's spin-down inertia and the function of modern clutch systems. Expert instruction from a recognized firearms historian highlights the technical aspects of operating this powerful weapon system.

This guide details the operational features of the H&K G11 K2, a prototype assault rifle known for its caseless ammunition and unique rotating drum bolt. It covers the selector settings, magazine capacity, integrated optics, and the internal action designed for recoil management during high-rate-of-fire bursts. Expert insights from Ian McCollum highlight the historical context and technical innovations of this advanced firearm.

This guide details the operation of the German L.Gr.W.36 50mm light mortar, as demonstrated by expert Ian McCollum. It covers assembly, leveling procedures, ammunition handling, and live fire execution, emphasizing the difficulty in visually tracking the projectile. The instruction highlights the importance of proper setup for accuracy.