Dear Vanman,
Congrats on your new Vanguard in .177! That is going to be a fantastic, laser-accurate setup for backyard pesting.
Regarding your question about the moderators, both Buck Rail and Red Corn Outdoors make excellent, high-quality units that some of our shooters have used on various Pinty models with great success. You really can't go wrong with either for light-duty backyard use.
However, before you spend extra cash on an aftermarket option, I’d highly recommend trying out the stock moderator that comes included with your Vanguard first. It does a surprisingly great job of taming the report out-of-the-box. Give it a shot on your property, and if the sound signature still isn't quite as backyard-friendly as you need, then you can definitely look into swapping it out for a Buck Rail or Red Corn.
Best regards,
Pinty Team