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Well a PDI 170% on an aluminium should NOT break mechs. If its a systema M170 then probably. I have had recoil pistons slamming the crap at my G&P and systema mechs and have had no problems.
Its probably because your airseal between the hop unit and the nozzle + airseal in the cylinder is not good causing it to "dry fire" even when you are firing BBs.
You can tell the difference between an airsealed system and a non airsealed system even during dry firing. A close to perfect airsealed system has a delay between the release of the piston and the impact on the cylinder head, and the air coming out is forceful. On a system thats not airsealed, the piston just slaps straight onto the cylinder head and sounds like a "slap" more than a "pop/smack".
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