Personally I don't know about the accuracy of the 17 HRM in the Striker but I really wouldn't worry.
If you go to the Fred Bullberry barrel site he has chronograph data on the 17 HRM with varying barrel lengths. According to his data , the highest velocity was obtained with a 18-19 " barrel. Above or below you start losing, but not by much. You'ld be surprised at the findings.
It is ironic that the Striker is made in Massachusetts, yet as a resident of the Commonwealth I cannot own one. The Atty Gen. said it isn't considered "safe" in his view. :evil: