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 Once in a while the answer is really straight forward and this is one of those times You do not need to change the feed lips or the follower on a standard 556/223 magazine, you just need to bevel the front lip at about 45 degrees (the exact angle doesn't seem to be a big deal) so the giant 50 Beowulf bullet goes up and, this is the key part, the leading lip of the brass caseUnited Defense AR15 Bolt Carrier Group for 127X42 (50 Cal) The United Defense AR15 127x42mm Bolt Carrier Group is a great option for your next AR15 build Chambered in the highly effective 127x42mm , this BCG is machined to strict military standardsHeadspaced Bolt Included 875 Gas Block Diameter; First 50 Beowulf Build Ar15 Com 50 cal beowulf ar 15 for sale