neighbors asking what i’m shooting

hi guys, i shoot a standard 18″ talon 177, my female neighbor asked across the board fence what i was shooting? was it a .22 rifle? forgot to mention i’m on co2, i’m sure she doesn’t no the difference, i had no idea it was that load to her. i
m now wondering, about a frame extender, would it quiet it down anymore, co2 is already pretty quiet. do you guy s think it would make a big difference in the report. i dont want her attention on this matter.