Xrayist
Single-Sixer
Easy for me...receiver sight on my No. 1S .338, factory peep sights on my Mini 14 and .308 Scout, and a Williams peep sight on my 10/22. At 68 my eyes are good enough to still use iron sights, especially receiver/peep sights, with the only exception being my 1903 Springfield as those open sights can be difficult to use in less than ideal lighting for me, but then just switch to my 03A3 and problem is solved.