I have a 21H round top 7x57,it has the sling swivels that measure 3/4" wide. I have been trying to find a decent sling that will fit but not having much luck.My gun has the G&H side mount installed by G&H with a 2-7 Leupold and the round bolt handle. It shoots very well,if you have the small screw that pulls the barrel down into the front of the stock adjusted just right.A question for those that have had the double set triggers changed out to a single,does the bottom metal where the trigger protrudes need to be changed?It appears that there would be a large open area left there by going to a single trigger.