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I have the M15A4 rifle. Other than the spring, piston head and cylinder head, all the internals are stock. I run a 9.6V 3800 mAh large battery that gives it a monstrous 22 rps rate of fire. Haven't had the slightest issue with the gun after an easy 10 000 rounds since the upgrades, and an easy 20 000+ before that.
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