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The HK223 is the semi-automatic civilian version of the HK416. It can be configured in a nearly identical fashion to the M27.
Recommended books and DVDs for gun owners:
Gun Digest 2012, The World’s Greatest Gun Book, 66th Edition – New!
Gun Digest 2011, The World’s Greatest Gun Book, 65th Edition
Gun Digest 1944-2009 3-DVD Set
2011 Standard Catalog of Firearms
Shop more at gundigeststore.com