Kaliber Argus 45 in .177

I've got an Argus 45 in .22 if that helps.
I don't know how quiet you are looking for. Have I spent money on the adapter and installed an aftermarket muffler, no. All I can say is, I can shoot it indoors, with my cats (2) nearby, and they aren't bothered by it.
Yes, I modified the stock.

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Mike
 
Thanks for your reply, I have had my share of high dollar PCP's. AZ put his touch on 2 RAW MFR'S, they were very quiet. I have got where I like a short quiet PCP. Cricket for the size is the quietest for me so far, that is why I asked, since the shroud is different. Anyone can put a silencer on and have a quieter PCP that is longer. I like the looks of yours.