The piston? Well..just make sure your AOE correction is on point because its made of mozzarella cheese and will strip on like you're waiting for a toonie slide (urban dictionary that.)
The hop up unit is where the shit goes down - first of all there is no after market replacement AND its proprietary - so if you do what i did, and over turn the adjustment wheel screw, you'll strip the threads and your hop up arm will never stay in the same place you set it to again.
Dboys uses the same clear plastic piston and clear plastic hop up unit in their guns - and speaking of Dboys, dont even get me started on their 2mm larger magwells and the fitment issues you'll have there.
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