The Spanish CB-51 Mosqueton, designed in 1951, was an experimental semi-automatic rifle chambered in 8x33mm Kurz, heavily influenced by the M1 Garand and StG-44. It featured a unique grip safety that also acted as a bolt release, but this design prevented the bolt from locking open on the last round, a significant flaw. Despite its advanced features for the time, Spain ultimately adopted the CETME rifle, leaving the CB-51 as a historical footnote.
The Gerat 06 and 06H rifles represent late-WWII German innovation, influencing post-war designs like the H&K G3. The Gerat 06, a gas-operated roller-locked rifle, was rejected for not being significantly cheaper than the StG 44. Its successor, the Gerat 06H, utilized a simpler roller-delayed blowback system and introduced the fluted chamber to solve extraction issues, a key development for future firearms.
The Sturmgewehr 45, a successor to the MP44 and ancestor to the HK91, was tested in an IPSC 3-Gun match. Despite its excellent ergonomics and low recoil, the rifle experienced significant feeding issues with vintage 30-round magazines, which were mitigated by reducing the magazine capacity to 20 rounds. The 8x33mm Kurz round proved comparable to the 5.56mm for controllability.
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