I just got a Tanto for my .177 Dreamline. She was a barkin a little too loud without a moderator. I took a risk buying the smallest, cheapest moderator DonnyFL sells, but I was very pleasantly surprised. The Dreamline is now at least as quiet as my Marauder (also .177), maybe even quieter. The gun is shooting around 900 fps with JSB 10.34s and pellets hitting their target are louder than the shot. I can even hear the regulator do its thing after the shot. Not only is this moderator effective, it is a work or art. Excellent fit and finish certainly compliments the overall appearance of the gun. Top notch manufacturing. The next gun that needs to be tamed will certainly be getting one of DonnyFL's products.