That just cements my thought that I need a mill. And a lathe...

I'm not sure I would've done the uhmw. It'd drive me nuts if it wasn't flat, flush, or if it got deformed. But, I'm also in the minority that thinks zero clearance inserts are a waste of effort. My thought was to make it one piece and just use the saw to cut through the fence. Then take them off again and grind them back a smidge.

I could cut those on the cnc, but first it's fences, then I'd be illegally producing rifle lowers. A rabbit hole I don't need to tumble down. Plus I'm pretty sure I can have fences made for less than the cost of the tooling.

What would you do differently?