WAY louder than I expected and ended up putting a 6.5" TKO thingy on the end. I have heard
the sound differences between the shorter HPA barrels and can tell you the 10" is noticeably
louder than the 12". I can imagine the 7.5" will NOT be backyard friendly without something
on the end.
Not scientific, but I hope this helps.
Head Gopher and Assistant
Match Director Ashland Air Rifle Range
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