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Old November 12, 2012, 11:59 AM   #11
Sweet Shooter
Senior Member
Join Date: June 17, 2011
Posts: 569
Thanks chaps. @big al hunter the SIGM400 is an AR. But I do get what you're saying. This basically illustrates the need for a tight, repeatable lock up between an upper and a lower... which many say is not important.
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