If you had it in 22 LR w could test it Marlins micro groove barrel concept. I saw a very old Marlin a friend caught while fishing off island. Was in bad shape but he sent it back to factory in the early 90s and he said they did a great job. I believe it had Ocotgon barrel.
Island Fishing: - a guy told me to always follow up each fishing trip by working the Island for bass etc but there are always poachers or those scouting who w rather chuck the gun in the river rather than answering any questions.
More than a few "interesting things" have been caught by accident.