The question would be more appropriately put in Clone Talk.
You are at the far low end but as long as the gun still cycles, you could leave it as long as it holds. But of you are intent on gettign it above .010", get some +4 rollers which will get you around .015" which is about perfect. If you have the orginal SW bolt-group, a new German or RCM locking piece can sometimes increase gap (but can decrease it as well depending on which way the SW lp could be off).
But if the gun runs well, I would leave it until it reaches .005" or just put in the +4 rollers.
Not really, it's actually a pretty common question. Most of time those who have the answers to techinical questions overlook the Rookie Corner. Typically the mods will move the post but this one may have slipped by.
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