Very nice. Thanks for posting.
I think that is a good combo - Spikes & Wesson! Ha ha.
I sort of have the same thing but with a carbine barrel. It's a S&W lower with Spikes Tactical M4 upper and a CMMG 16" M4LE barrel. I have a lo pro gas block and am running a DD MFR 12.0 rail over the barrel. For these purposes, I'll omit description of the furniture beyond that it is mostly Magpul.
I would have preferred a middy 16, but the carbine barrel was all I could get in melonite at the time of the build, and I wanted that treatment on this barrel. It's worked out great for me. And the "plus" is that it's registered for FFL transfer as a Smith and Wesson. Despite the high quality rifles from many very good companies, the S&W name, even as a late entry to "black guns" does have some clout come resale time, if I were ever to do so. S&W seems to have done their homework well on the lower. I did upgrade the trigger, which seemed generally good, but well above expected pull weight.