I have shot a Browning 22 auto rifle with a commercial suppressor that was as quite as an air rifle with normal high velocity ammunition. It cycled normally



Pete

The link didn't work for me, so I couldn't see what it was.

I have a Ruger 10/22 with a 20" internally suppressed "Cloak" barrel by Advanced Armament and it is VERY quiet.

The design is "non-ported", meaning it must be fed sub-sonic ammo to avoid the sonic crack, which, with CCI Mini-Mags is as loud enough to be uncomfortable to your ears. The Browning that Pistoleer shot was most likely ported, to bleed off some powder gas to keep the bullet below the speed of sound.

In my rig, with .22 short target ammo (830FPS - listed) the bolt doesn't cycle and the only sound is the "click" of the rifle mechanics and the "smack" of the bullet. It is much quieter than my Beeman 5mm R10 pellet rifle (850+/- FPS).

With Remington .22 long rifle HP sub-sonic ammo (1,010 FPS - chrono'ed), it is still very quiet, but noticeably louder than the shorts. The action cycles vigorously, and at night, a small amout of sparks can be seen exiting the breech as it cycles, so I suspect a little bit of the sound is caused by still-expanding gas in addition to the metal-to-metal action noise. I may be able to reduce this metal sound further if I install a commercial recoil buffer in place of the factory steel bolt stop pin. Even with thae action noise, it is still quieter than my Beeman. If the bolt is held shut (right thumb behind the operating handle), it is only slightly louder than with the shorts, but the bullet smack is considerably louder. In fact, I was amazed at just how startlingly loud the bullet impact on game really is.