Posted: 5/3/2009 2:06:34 PM EDT
I have a Teppo jutsu 458 SOCOM upper, and on some empty magazines the BCG will get jammed about 1/2" out of battery. I have to take the rear take down pin out just to get it to release. I tried a different lower, and it would work on the mags that don't work with the lower I have for the 458 upper. The lower I built using a Mega receiver and a RRA LPK with two stage trigger. I can't figure out why some mags this happens on. Would it be the upper, or the lower?