Touch up the hammer sear surfaces with a file. See if that fixes it.
Mental note to self - "Keep grinding" :Grind too much and you might have some double and triple fires.![]()
Ohh.. me likeyThe brown shirts can start with the AR guys who buy these.
http://www.hi-vel.com/Catalog__22/M-16_Full-Auto_Spare_Parts/m-16_full-auto_spare_parts.html