I bought an OEM-1 pre-election and then bought some take off 6920 furniture for it. Came out cheaper than a factory 6920 at the time. Now, not so much.
You won't have an issue with a canted front sight post. The things you're guarantied with Colt is function and quality parts (excluding the Expanse models), People have complained they are not the most "pretty" from the factory but I have not had an issue with my 4 Colt rifles all produced in the last five years.