I had considered this (grinding the pin) as the difference is minor on the face of things, but Paul from Tyga informed me that indeed there is a difference between the pins from the '16 and later models that they were not aware of. In the end, I have bought new pistons that will suit the new pins and rings I have, as well as the old MC16 barrels. Hopefully I can get more mileage out of the bike before the next rebuild this way, but as to if those ks are worth the extra $225...
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'87 MC16