Yeah, "a JM tune". JM doesn't tune guns that I know of. Did you buy it? If so, tell him to wrap it in bubble wrap and secure it inside that pillared case. Those things have damaged more stocks than you know with those stupid pillars.
And, no matter how good the tune parts, it all comes down to how well it was tuned. If the guy's a challenged DIYer, that may not be a big plus.