05-18-2015, 04:55 AM
Had a 556R that just sat in the safe with no love, so I decided to give her some. The process was pretty straight foreward with the exception of the mag well. Chambered an X-Caliber 6.5 barrel blank and reverse enginered the 7.62 barrel threads and conture. Original build thread: http://www.sigarms556.com/threads/556r-t...del.15300/

