Roller-Delay Showdown: Angstadt MDP-9 vs H&K SP-5

The Angstadt MDP-9 offers a lightweight, bufferless design utilizing a roller-delayed blowback system, akin to the MP5, for reduced recoil. It accepts Glock magazines and AR-15 fire control groups, weighing only 3.5 lbs empty. Despite its advanced features and excellent performance, especially suppressed, its $2,700 price point positions it as a niche, high-end PCC.

This video presents a direct comparison between two popular PCC (Pistol Caliber Carbine) models: the Stribog SP9A1 and the SP9A3. The analysis focuses on their operating systems, highlighting the differences between direct blowback and roller-delayed blowback mechanisms. The video includes live fire segments to demonstrate the performance of each firearm, culminating in a conclusion and outro summarizing the findings.

This review covers the Mertsav MSG-9PM, a Turkish-made 9mm MP5K clone. It highlights the firearm's compact size, roller-delayed blowback system offering softer recoil, and compatibility with HK magazines. The MSG-9PM is presented as a more affordable alternative to genuine HK MP5K models, suitable for tactical applications and defense.

Elliott Delp reviews the Springfield Kuna, a 9mm PCC with a roller-delayed blowback system, highlighting its low recoil and suitability for home defense and as a truck gun. The system is noted for being easy to train with and ambidextrous, making it accessible to all shooters. Delp suggests its fun factor and versatility make it a desirable firearm.

Elliott Delp provides an expert review of the Grand Power Stribog SP9 A3G, highlighting its unique roller-delayed blowback system for reduced recoil and its compatibility with Glock magazines. The review covers its FDE finish, folding brace, and built-in sights, positioning it as an accessible and fun 9mm PCC option.

Roger Barrera of QVO Tactical introduces the PTR 9SDM at SHOT Show 2026, highlighting its innovative 'three-stamp' design featuring a blast chamber for subsonic conversion and a versatile Universal SD Adapter (USBA) with Dual HUB Mounting. This MP5-style firearm is designed to slow down supersonic 9mm rounds to subsonic speeds, enhancing suppressed shooting capabilities. The firearm is noted for its immediate availability.

This video details the unique 'French Finger Trap' issue with the MAS-36 rifle's bayonet, where two rifles can become unintentionally locked together. A 1951 French arsenal memorandum identified this problem, proposing a simple modification to the bayonet handle. Drilling a small hole allows a tool, like a firing pin, to depress the internal spring, enabling the separation of locked rifles.

The M134 Minigun is a scaled-down 7.62 NATO rotary cannon, requiring 24V DC power and consuming 1.5 kW. Its high rate of fire (3,000+ RPM) is essential for aircraft engagement windows. The complex delinker mechanism is critical for feeding ammunition, and practical hand-held use is impossible due to weight and recoil. Live fire demonstrates rapid ammunition consumption and the need for indirect aiming.

The H&K G11 is a revolutionary prototype assault rifle designed in the late 20th century, notable for its caseless ammunition and unique rotating drum bolt mechanism. Despite advanced features like a 2000 RPM burst fire rate and integrated optics, its development was ultimately halted by geopolitical shifts and cost concerns.

This video demonstrates the assembly and live-fire of the German 1936 pattern light mortar (L.Gr.W.36). It highlights the mortar's leveling mechanism for accuracy and the difficulty in visually tracking its 50mm projectiles after firing. The content showcases historical military hardware and its operational use.