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upper/lower compatibility by brand


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  The AR 15 family , ( as far as forged receivers , not sure how Billet receivers fair )  they are all MilSpec. & have a excellent chance of matching up functionally . I would not interchange  308 AR Manufacturers uppers & lowers & its not just an Armilite ,DPMS thing , I have seen that tolerance stacking can interfere with proper function , when using different manufactures for the Receivers, just my experience. Too many fix's tweaks or things just not working , when they do in other rifles with matching components.


   I even do the same with my AR 15 builds now , I stay with the same manufacturer Upper & Lower Receivers.   <dontknow>

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