Spikes Tactical

I have been talking and reading about M4’s and right now I am talking to a dealer and he keeps pushing Spikes Tactical. He’s telling me for the money I am looking to spend he could put together something from Spikes cheaper and better than any premade gun from any of the manufactures for example: LMT Defender Standard Model 16. I don’t think he’s saying that LMT is a bad gun just the complete systems are not always the best choice. Opinions please. thanks