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Just a blade with a very fine v so that the front bead sits in the v so that the top of the bead is level with the top of the leaf and the bottom of the bead sits level with the bottom of the v. You...

If it's open sights just set it up with a 100yd leaf so it shoots about 2" high at 100 yds. Then out to 300 yds you just have to aim at the top of the back. Having multiple leafs will see the wrong...