In many, many years of using Maccari kits I can honestly say I never once had a buzz problem to the best of my memory. I'm not saying you didn't see or hear or feel what you said you did. I'm just saying it never happened to me once. Go figure. I hope he doesn't hear of this and start making his guides even tighter! Like I just said, they're already plenty tight enough in my experience, and making them tighter could unnecessarily cause a loss in velocity and an increase in break-in time.
Safe and Happy Shooting!
Ed Krzynowek, The Airgun Tune-Meister
"We can rebuild the squirrel. Make him stronger, faster...We have the technology"---Skyler M.