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Scott, there is not Sir. The fit between upper and lower is a pre-built tolerance that is actually very tight.

Scott - Ruger builds a good gun. The fit between the upper and lower receiver will be a good fit. However, should it have more 'play' than you prefer, there is a little device called 'accuwedge' one can buy and use that virtually eliminates any 'play' at all. You can find them here: www.cdnnsports.com/acc-uwedge-for-ar15.html?___SID=U Cost - $2 or so.