If you really think noise from a .22 cb or other is going to be a problem, there are at least a dozen homemade supperssers available on the net. The one that uses a $6 lawnmower muffler works extremely well. A penny balloon over the end of the barrel will disperse the sound; Having said that, my Benj Pump makes a lot more noise than my .22 using the least powerful cb cap.