Took close to 2 years but I finally got it done. Haven’t taken it to range yet as we’re in lockdown but can’t wait to give it a spin. Upper and lower have my matching serial numbers. The ATPIAL-C (PEQ15) will probably need to be moved slightly or the bi-pod moved further back as the QD bipod lever can’t be used in this setup. I now understand why I’ve seen pictures of the PEQ mounted on top, which I did originally.