Texag84, I have been using the M2C blocks since mid 2012 and between the three SC10 4x4's I owned I put over 70 weekends of practice/racing on them without one hinge pin failure. Something does not sound right, is the breakage happening after a hard crash or just during normal racing? How much toe/anti squat are you running? And are you saying you snap both ends of the same hinge pin? You may also want to contact M2C directly, perhaps there was a bad batch (under/over hardened pins) or at least suggest a cure or provide a reason for the failures.