Late jumping in on this but can't speak highly enough of Luke. His knowledge, care, attention to detail, customer service, communication and prices are all fantastic.
He took my M14 that had previously been converted to DMR (and ruined, frankly) and transformed it into an absolute monster.
The guy doesn't stop working either, providing voice and video messages and letting you know exactly what he's doing, what he'd recommend and how he can save you money.
Regarding length of time to respond, with me he was real quick, but this was late last year. Bear in mind the poor fucker caught Covid too.