you may try prometheus sp100 too!
and as Styrak & Crunchmeister said:
-steel bushings with appropriate shimming, systema or guarder
-spring guide, guarder is fine and cheap, why not installing it while you open the mechbox? Never hurts
-inner barrel, your choice and budget
you may watch for mAh available on your battery, power may last a little less than it is now because of the increased demand for the harder spring.
but it's a good debut for a mild upgraded aeg
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