I guess you are referring to the Recoil Spring?
As far as I know, there's still no upgrades for the NS2 system; And I can't tell if a TM Spring would fit. I can take a look and compare with my HiCapa's spring, but right off the top of my head, I'm pretty sure it's not appropriate.
All in all, I'm not sure why you'd want to increase the recoil spring's strength, as it is already pretty stiff and blowback's already pretty hard, at least on mine.
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Quote:
Originally Posted by Brian McIlmoyle
Real life comparison,
GBBR- bang bang -- Giggle
AEG-- merrrzip merrzip -- meh
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