Hyperdouraku got sample units of the Deepfire HK Titanium piston and has made first impression of the item. They will soon compare it to other pistons to see if such change in material would cause some improvements in the performance of Marui AEGs. Please do not however that the piston only has Titanium teeth, but the piston body is plastic, lest you might think the whole product is fully made of titanium, which will just make it very expensive.