Have you noticed your FV-SR burning through extractors? I've been through 3 sets of extractors on my FV-SR since putting a can on it about 5-6 years ago. My theory is all the crap dulls them down. I'm about to switch to a ruger american just to try something different. Maybe a CZ.You don't want to go cheap with NFA items, you go with what you really want and try to find the best price.
For 22lr, the mask is King. Weight is its only negative, which isn't bad, but compared to some that weigh next to nothing...
For 9mm, Obsidian is very popular for many reasons, but sound being a very good reason. The R9 will not be as quiet, but definitely a good option.
For quietly taking out critters around the neighborhood, this is what you seek:
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