the 100MG core had 5 bearings i think weighing in at 6.1 oz, the chronarch 100D has 7 bearings and is 7.5 oz, but has an all aluminum frame and sideplates. same line capacity. 50 dollar price difference
now the core 50 is out, it's like $379 and weighs 5.5 oz
, but has more bearings i think