Tom.. thank you, I'd heard the term but never really looked into it... I've been shooting the USPSA practical pistol and 3 gun for a long time, and even with increasing age, still like to play....the Chevy Truck STC was an optics event, and I shoot TacOptics for 3 gun...my vision wouldn't allow me to use a peep sight very proficiently...the shooting on the move will be hard to give up someday...
Tyler... if you are going to mount something like a Williams peep combo on the receiver, look to a good Weaver style base, mount the rail frist, then mount the sight to the rail...a globe front sight will allow you to hold elevation as the Sun light changes throughout the year
my CMMG dedicated .22lr barrel upper shoots with my 10/22 out to 50y, and allows me to use my AR lower with a good trigger, with the same weight format...we have a local club that is beginning to shoot a 2 gun (pistol rifle) format on small steel, and is a lot of fun... there are other conversion units out there, but go with a dedicated barrel with 1/16 or so twist and barrel diameter for .22lr and not 5.56...