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https://www.msrdistribution.com/parts-barrels?specs=243%7c%7ccategory%3areceivers%21%210%21%21%7c%7ccategory%3aak-47%2fak-74%21%21-5%21%21%7c%7cf_caliber%3a5.56x45+nato%21%21860%21%21&viewmode=grid
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