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If 08 or earlier, then a back cap is a fairly necessary upgrade. Beyond that, nothing is NEEDED.
Most people prefer to get an aftermarket trigger, on/off asa, metal feedneck. Many prefer to get the UL frame instead of just a trigger for the stock frame, since it comes with a better board also. Most people also get a different barrel.
If 09, nothing unless you don't like the stock UL trigger.
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