Super SPAMF Fidlock Mount
A remix of Telcon's SPAMF rail priming arms, with an embedded fidlock mount added. You can mirror it if you want the other orientation. Works with the standard opposite side priming bar, or you can get the one from Telcon's file if you want more symmetry (or a rail!).
It'll print ugly and need supports, God be with you, but it works. I printed at 100% infill.
Oriented to end up on the LEFT side of the blaster.