APOD Firearms

Hi shelf vs low shelf AR?

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    shooter521

    shooter521

    Certified Glock Nut
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    May 13, 2008
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    Indianapolis, IN US
    IIRC, the "high shelf" guns (mostly Colt Sporters and such) have altered internal dimensions to prevent the installation of a (registered) drop-in auto sear or Lightning Link; the shelf would need to be machined off in order for an RDIAS or RLL to fit. "Low shelf" receivers can accept these devices to be installed without modification.
     
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