you had to cut that notch, square bit, out of the housing to fit the sight because you essentially fit an MEU sight to a standard 1911a1 blowback housing. Of all the cross compatible parts of a MEU and 1911, the only thing that doesnt work is an MEU sight on a 1911 blowback housing
however, the MEU housing will work with the 1911 sights -- it is strange that they dont use the one design for both pistols but hey, it is how it is.
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