How do you go about getting uppers in different calibers? I have the 300 wm, but am thinking about the 30-06 or .308. I have googled it up so far and not really any options on the uppers. Also, I field stripped my R1 and cleaned it. It was jamming after I attempted to shoot it suppressed. Don't try to shoot it suppressed - it can't be done unless you are a gunsmith and are willing to figure it out and make special springs etc. Also, it never jammed until I shot it suppressed. I think the back blast of gases was increased and blew more dirt into the action. Also, does anyone have a link to how to clean the gasport. Thanks...