Love my 10-22 waiting for these guys to start production again http://www.nodakspud.com/NDS-22.htm for a build your own.Shoot them a e-mail and they will give you a heads up.
Very nice this guy has this http://www.m-guns.com/tools.php wich IMO is better in getting around obstacles with light above the rifle bore.He's perfecting it should be available around fall 2012.Battle comp has something similar but it sits a little higher above bore.Michi-guns will allow light laser combo above bore.With laser running parralel to barrel you would have a costant zero just have to figure offset.