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depends what year you get? lol
for starters -
-Delrin ACS bolt
-barrel of preferance (i like J&J Ceramic barrels, also the Progressives are nice too)
-Dye Sticky 3 Grips (not necessary but a good investment)
advanced users
-new spring kits, Orings, and other internal replacements
-add on a regulator if your gun doesnt already have one
-e hopper
big spender investments
-barrel kits
-boards
-new board for higher speed rates
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