9.6 nicads/nimh is safe enought for your gun with good rof. Just proper shimming, change to metal bushings, use a spring guide w/bearing (better if metal), then you are good to go. What i like about using low fps springs is lesser maintenance. if you want to be more safe and if you have a budget, use CA STU gears, it will lessen the strain on your motor and piston body, but you will lose a lot of rof. I had a Cyma 035 AK74su, running on stock springs, stock gear, eg1000 motor and an 11.1v 12c lipo, still running great after emptying 3 bags of bb's @ 1000rpm. Trigger response is great. you have to use sector chips though to prevent misfeeding.
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AK Addictus
Pistolero Aspirant
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