To tell the truth, I forgot about the LCI on the PCR. It has never given me any issues, and I never used it. My PCR has about 10K through it and I can’t think of any issues with chambering for any reason, the most obvious would have been the LCR. I drop a drop of rem oil when I clean the upper, so I’m sure that has helped with reliability. I have a 75DUpper on a p-01 frame, no issues there either. The LCI in my opinion is there but nothing to worry about.