Originally Posted by Old Navy

No it's stock barrel. There have been 22 rim-fire rifles with polygonal barrels for years shooting lead in some very high end target rifles. It all about correct powder and proper cleaning.

You don't shoot lead at 1200 to 1600 FPS, I load my hard cast 170's so they will only be in 900 to 1100 range. Makes for pleasant day at the range, and hand and wrist still functional next day.