I know everyone has their "go-to" filament(s) for various parts. For me with 2A, it is usually PLA+, PAHT-CF, and PPA-CF. What I have really enjoyed about this filament is how easy the supports were to dial in. They pop right off and leave a pretty good looking contact point.
My Urutau's bolt and upper receiver, both in PLA+, developed a crack recently and figured I might as well reprint the handgaurd while I was at it.
Nylon 6 always has super clean support breaks for me, wonder what it is about the material that causes that.