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  • shooter521

    Certified Glock Nut
    Rating - 100%
    17   0   0
    May 13, 2008
    19,185
    48
    Indianapolis, IN US
    Ruger SR556.
    Piston-drive with Quick Change barrel

    It's a flat top upper with quad rail forearm and folding battle sights.
    I've got a few coming.

    And as an interesting Hoosier connection, one of the faculty members at Purdue University Calumet published a technical report on it back in July of last year...

    From Purdue Cal's "Summary of Faculty Productivity":
    Purdue University Calumet | School of Technology

    Higley, J. B., A First Evaluation of the SR556, an internal, confidential report evaluating a product design for Sturm, Ruger, Inc., Newport NH., July 2008.
     
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