Note that I did a little welding to the bolt carrier when I shortened the front section by about an inch. It is best to make the cut and splice close to the front. Even when using a brass rod inside the carrier to align the pieces there will be some grinding required on the inside the smooth out the weld. I managed to reach inside with a small dremel stone but it was barely within my reach. I was just lucky it didn't turn into a PITA that takes hours to fix. "I'd rather be lucky......"