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In my experiences, the stock cylinder and piston heads sealed great, just putting a modify nozzle on increased compression to perfect. I recommend the ARS hopup rubber, and a tightbore (I installed a Systema). A bearing spring guide is also a good plan. Can't comment on the rest of the externals.
Also the PMags should fit and feed well, but be aware plastic MAG mags do not.
Also I love the hop-up unit. I've worked on many styles of guns and next to the TM M14 it is my favorite.
The above comments were meant for the cansoft version.
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