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Gallery
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Bolt Cover
Depress the bolt cover latch (6) found on the back of the receiver (79), and push the bolt cover (5) forward.
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Bolt Carrier Assembly
Pull the cocking handle/bolt/bolt carrier (3) assembly to the rear and pull up to withdraw the assembly.
Great powers have often used smaller conflicts as test beds for new weapon systems, and also as dumping grounds for obsolete machinery. The Spanish Civil War was one such conflict.