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I agree with what was said above. If you start adding steel trigger sets or bolt etc, then you need to do the whole thing or you'll run into problems later.
So NPAS (an absolute must), maybe a heavier buffer; you can also put in a better hopup rubber (wide choice of TM Hi-Capa/VSR10 buckings to choose from), hopup spacer (again, different people have different preferences: it'll depend on the bucking, too. AEG buckings work.) Maybe an inner barrel.
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