Quieting the bark of Air Arms

[bchannell]

I have an S400 MPR FT and an HFT500. I love them both but the air strippers are annoyingly loud ans shrp. Any ideas to quiet them down?

 

[wildcj5]

This is what I use on my 500.

Rowan Engineering

On my s400 I use on of the DonnyFL.

 

[Gerry52]

Donny FL