Ill look in to fire lapping and probably polish after words thanksCutting lead in airgun pretty easy. PTG throating reamer I'd go with the pilot. You can rent if you don't want to buy. I wouldn't worry about that 12 twist at under 1000 fps I doubt the slug will be stressed. I would hand lap that green mountain barrel or fire lap it at least. It really helps.on soft lead slugs and pellets. Green Mountain barrels are about the same as ER Shaw ,Douglas, barrels. I really prefer hand lapped barrels.Spoiled good luck I'm sure you'll have a shooter
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