The B&T KH9-SD revives the 1980s Site Spectre design as a modern, integrally suppressed submachine gun. It features a ported barrel system to subsonic standard 9mm rounds, offering exceptional quietness. Despite its direct blowback action, it exhibits manageable recoil and high controllability, enhanced by Swiss engineering. The KH9-SD also boasts modular magazine compatibility, including Suomi drums, and a unique DA/SA trigger, positioning it as a high-end, retro-inspired collector's item.
The B&T GHM-9 is presented as a cost-effective 9mm PCC, leveraging existing components from the APC-9 and KH-9 to reduce manufacturing expenses. Key design elements include a longer bolt and receiver to accommodate sufficient bolt mass for blowback operation and a unique hydraulic buffer system. Modularity is a strong point, with options for different stocks and magazine compatibility (B&T proprietary or Glock).
The B&T TP9, an evolution of the Steyr TMP, is a compact PDW with a unique rotating barrel system. While offering extreme compactness for roles like vehicle work, it suffers from significant gas blowback, especially when suppressed, and a poor trigger. Its ergonomics are heavily right-hand biased, and iron sights are inadequate, necessitating an optic. Reliability issues with carbon buildup during suppressed full-auto fire require frequent maintenance.
The SIG 310 (MP48) represents a simplified, cost-effective evolution of SIG's earlier MK series submachine guns. Despite its compact design and a folding magazine well for transport, it offers surprisingly controllable full-auto fire at a high rate of 1026 RPM. The firearm utilizes a straight blowback, open-bolt system and features a unique retention mechanism for its charging handle.
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