I have three side-levers, two Grants and a Lancaster. The Grants, 12 & 16, are right, and the Lancaster, 12 hammer, is a left. The left side for me, a right handed shooter, is far more comfortable than the the right. I was told when seeking to convert the rights to left that the right side was tradition for loaders, and the left for shooters. Not sure how accurate that statement was. Never converted the Grants as it was not problematic (and very expensive).