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Message: <blockquote data-quote="Super Dave" data-source="post: 1587678" data-attributes="member: 8429">Just keep your upper and slide on stock from the sbr, put it on the SMG when you get the urge (probably most of the time?), and put your 5.56 on the SBR.  Oh, wait, you mean the Hahn block in the SMG.  That makes sense.  SBR, SMG, OMG, WTF???I think the bolt is unramped for your RO635, so it seems like buying a ramped bolt would  be a wise move, as not to alter the original (you know, by machining it).  When you have the original upper on it, it is morally imperative that you sling it "commando" style, with a GI black strap, with tape covering the adjuster hootises (what's the plural for hootis?).  I think you need a DEA upper for it too!!!!</blockquote>