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What would be the basic principle behind ultra sonic whistle ports. Some of the research I've done points out that most of the report is a kind of helmholtz resonance rather than a clap from the over pressure. So I guess it would be a much of really small holes, say under 0.010" and probably...

So does the ATF meter dB or dB and frequency? Here's my thinking on the subject, a car muffler removes the higher frequency sounds and depending on the muffler it can attenuate the lower freqs too. There are really loud mufflers that attenuate the higher freqs and leave the lower at or near...

I found this post while looking for accessories for my 18-7. They may have had a hard life, but they are top notch firearms. Mine is atleast 5 years older than me, and still goes boom every time I pull the trigger. The only down side I have found so far is a lack of accessories.