The mechanical wear on the trigger block is next to nothing. I've broken 5 triggers on a really old G&P M4 without ever having any wear on the trigger block.
The only mosfets that are going to actually replace the mechanical contacts are either microswitch triggers (which are shit) or some like the BTC spectre which uses a button switch.
Anyway, don't worry about breaking the contact block. You only need to worry about burning the contacts or melting the block if you're using an 11.1v lipo or 9.6v large NiMH.
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