One of a kind 1916 prototype: the Iver Johnson blow-forward 25ACP

This video provides an expert-level review of the M15 (T44E5) rifle, an American military prototype developed from the T44 program that eventually led to the M14. Ian McCollum of Forgotten Weapons details its design, intended role as a light machine gun to replace several existing firearms, and the reasons it was adopted but never mass-produced. The review highlights its heavy barrel, bipod, and select-fire capability, contrasting it with the standard M14 and discussing the challenges faced during testing at Aberdeen Proving Grounds.

This review details AR-15 serial number 6, a rare original configuration prototype from the Springfield Armory National Historic Site. It explores the AR-15's lineage from Project Salvo and its development from the AR-10, highlighting key design features like the original 25-round straight magazine and top-mounted charging handle. The video contrasts early prototype elements with later modifications made after military trials, such as the rear charging handle and 20-round magazine.

This entry details the ZK-466 submachine gun, a rare prototype developed in Czechoslovakia in 1946. It highlights the unique folding magazine well mechanism, the Czech designation system, and its select-fire capabilities. The video features Ian McCollum, demonstrating deep knowledge of historical firearm design and rare prototypes.

This entry details the Staccato HD C4X prototype showcased at SHOT Show 2026 by Roger Barrera of QVO Tactical. Key features include an integrated one-piece barrel and compensator, a modular grip system compatible with Glock 19 and Glock 17 magazines, and an optics-ready slide. The prototype emphasizes Staccato's R&D efforts in firearm performance enhancement.

This video explores a unique Browning Auto-5 prototype modified by Winchester to circumvent John Browning's patents. Winchester's refusal to pay royalties led Browning to partner with FN, forcing Winchester to innovate. The prototype features a ribbed barrel for manual cycling, a workaround for the patented bolt handle, and early serial numbers indicating personal use by Browning.

This expert-level overview from Ian McCollum of Forgotten Weapons details the rare Pancor Jackhammer Mk3 prototype. It covers the shotgun's development history, the reasons for its project failure, and its unique mechanical features, including a gas-operated blow-forward system and a distinctive revolving drum magazine. The analysis highlights the prototype's non-functional status and its historical significance as a legendary 'forgotten weapon'.

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.