and what are the main differences ?
stick with Tokyo Marui Piston/Piston head assemblies...
Silent... because it's the most tactical sounding word of the four. :wink:
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Systema brand upgrades are one of the best to get on your gun.
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thanks its for a MP5K i'm buying i was thinking silence was best because of it being a CQB gun and all but i wasn't sure if the silent piston head sacrificed power for quietness