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.
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