A stainless steel brush will remove your rifling!!!!!!!!!!!!!!! Scratch your barrel from one end to the other!!!!!!!!!!!!!!!!!!When they first came out
25 years or so ago I was shooting high power silhouette and we had a couple competitors ruin custom barrels with them. One of the guys had Hawkeye Bore Scope and we got to see the damage caused first hand. Thank God I did not have the opportunity to use the ones I had just bought!!!!!!!
Best regards,
Grit