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The bolt-action Spanish FR-8 was a stopgap firearm, thrown into service by the Spanish when they were already moving toward the 7.62x51 mm NATO-chambered Cetme rifle. The FR-8 shares the later rifle's chambering, and actually appears to be a gas gun, though the tube is simply storage for a cleaning rod. For more on this unique piece of history, check out this "I Have This Old Gun" segment from a recent episode of American Rifleman Television.
Across 250 years of history, the actions of the Army have been closely intertwined with the direction and growth of the United States as a nation, and at the heart of it all was the soldier and his longarm.