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Not sure if this is what your looking for but I have this CO2 Chaser is 22 cal. Kexuan red dot and suppressor for $100 plus shipping. All so the origanal rear sight.
I bought the Chaser in .177 a while back in the rifle kit. I immediately installed the longer barrel and was very impressed with accuracy out to 30yds. It was pretty quiet, definitely backyard friendly.