RWS RWS 54 TUNER?

Give John a call.

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When I bought my D54 I was not happy with it at all. I had John Thomas tune it, he cut the groups in half. It was now shootable but not what I wanted. This is when I added the tuner. I have been shooting tuners on my PB benchrest guns for about 15 years. They will improve how any rifle shoots in my experience. Tuning the harmonics of your barrel to a particular pellet is always a plus and not attainable by any other method that I am aware of, especially a spring Airgun.