I have a suppressor on order for my Glock21. From the experiments I have been doing. I dont see how I am going to use my standard sites. The CAN will be in the way. I was going to replace the standard site with an Aro-tek Ghost ring 3 dot night set, but if I cant use them, well. How do you guys do it? Are you using built up sites? How much will the can effect my accuracy?