I've got an older Bushmaster XM-15 and I hate the removable carrying handle sights and the A2 front sight. Do you think it is stupid to cut down the A2 sight gas block and make the XM-15 a flattop? My eyes are getting bad and I would like to have a low profile red dot on the gun. The A2 sight is totally in the way. I know a scope would be OK because I've got an AR like this but this one I don't want a scope on it. I know after market gas blocks are availability but for some reason I see a headache doing one of these.