I had a 6.5 on my .22 Disco, and it was very quiet. Quieter than my springers. It was on par with my Mrods. You can get an HDD for the Disco from AoA for $25ish I think, and it gives you better efficiency/more shots, but I can't give specifics as I was forced to sell my Discos. And, you can easily make your own power adjuster to tune your Disco up or down. There are plenty of posts here or YouTube vids that show you how. I found all the parts at my local Ace Hardware and had my power adjuster made and installed in less than an hour. While you're at it, check out how to do a 3 screw trigger mod. Easy and well worth the time and cents involved. I ended up with very nice triggers on both my Discos. I will go that route again when I get the chance. I love that platform.
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