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Turn your SIG Sauer 556 rifle into the ultimate firearm by making it look like the SIG 551! This conversion parts kit includes an original SIG 30 rd magazine, a complete stock set in the color of your choice, an original 550/551 semi-automatic lower receiver with orginal Swiss made internals, two receiver pins, a 551 style barrel with a 551 style flash hider manufactured in the USA and a US made bayonet lug & pin.
https://www.cogunsales.com/index.php?pa ... t&Itemid=1