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https://www.msrdistribution.com/parts-barrels?specs=f_caliber%3a5.56x45+nato%21%21860%21%21%7c%7cf_type%3arpk%21%210%21%21%7c%7cf_caliber%3a5.45x39%21%21820%21%21&stock=include_out_of_stock_products
2 products found.