I saw well engineered 9mm with a CMMG dedicated lower and full length floating foreend at the C&E show last week in Raleigh. The gentleman who makes these gives me two options. 1. Glock magazines 2. Colt/UZI magazines I was told that LRBO will not work with Glock magazines but it can be accomplished with option #2. Is it critical to have the LRBO option or not. I was also told the filling the colt/ uzi magazines are a bit of a chore when going for full capacity on 30 round magazines. I didn't find a speed loader for the colt/uzi magazines so I was leaning toward the Glock route. I don't own any Glocks so using magazines for a dual purpose is a mute point. I could use some real suggestions on which way to go. Please refrain from bashing my AR choice as that would also be a mute point. Any real suggestions greatly appreciated. Thanks and have a merry Christmas and a happy New Year.