I fired quite a few more rounds this time, and after the last group (photo below) I noticed the flyer at 9:00 o'clock. Looked down at the scope, and it had moved. Reaction to recoil is pushing it forward. It had even pulled the barrel bands cockeyed, as a result of the sight trying to force the upper handguard forward. Scratching my head for a solution to this one!
Still, it’s a good group and a good deal.
Hmmmm...
For what it’s worth, my barrel bands shift from heavy shooting with just the plain iron sights.