NEW STEP BY STEP MAP FOR FRT-15L3

 I contacted them and they advisable applying their pins.  Just that simple, seemingly innocuous modify, was The problem.  The file’ing trigger pins induced it to fail.  All other parts during the lower had been true Colt sections.   No challenges following that.  Tag for info. I've an older Stag sixteen" 9mm AR with zero recoil as a result