fritzthemoose 3 Posted April 14, 2014 Report Share Posted April 14, 2014 I know there was a thread about it but cannot find it. is the lower from the old mka and the xn the same? Meaning can I put the xn barrel and so forth into an old receiver if i change the guide rod too? Quote Link to post Share on other sites
isma 0 Posted April 15, 2014 Report Share Posted April 15, 2014 For me,Yes . I need to tear down my polymer lower to see if have any fit issues. This is my Pre-XN upper on SAS FIREARMS LOWER So far fit like a glove! Quote Link to post Share on other sites
isma 0 Posted April 15, 2014 Report Share Posted April 15, 2014 (edited) The uppers are different treads on guide rod ( left hand).this video mate help. Edited April 15, 2014 by isma Quote Link to post Share on other sites
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