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M249S measurements/changes from a 249


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Can someone help me out. I need a couple measurements from a FN 249S to compare to my MGA 249. I want to see if semi FN oprod/trigger housing will fit or the high desert dog will fit.

Need the distance from the front clip for the lower to the end where the pin inserts.  I'm assuming the auto lower wont just clip into a semi frame gun but need to see if I can fit a semi FN to my MGA.


next the distances from the TOP of each rail to the BOTTOM of the receiver and the WIDTH of each rail. I know the semi rails are thicker.

please see image




Thanks for the help


Edited by taylorwso
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