300 Blackout (BLK) Trim Jig

This is a trim jig to convert a 5.56 casing into a 300 Blackout case, that clamps into the Harbour Freight mini cut-off saw (SKU: 70478).  

To use this jig:

1. Clamp jig into the saw.  It should fit easily around the grooves.  
2. Slide 5.56 case into jig from the right and press in until flush
   1. Fit will be tight at first but will ease over extended use.
   2. This was to ensure it wasn't too loose after multiple uses
3. Plug in saw, turn on saw, press safety button, and press down to cut case until saw stops on the safety stop
   1. The built-in safety stop prevents the saw from cutting into your jig so you can focus on how beautiful the cut was instead of trying not to cut your print in half
   2. Ejection ramp under casing shoots the discarded tip of the case out of the way so you can keep shoving more cases in to be cut
4. After case has been cut, push in another case and do it again. Or not.  Skip to 5 if you ran out of cases to cut.
   1. Case channel extends past the chop area and ramps down so you can keep cutting and the cut cases will discard to the left out or your way.
5. You're technically done with the steps for using this jig now.  It's up to you to know how to finish it up.  There will be plenty of brass to trim to get to whatever spec you want for length.
   1. Cut case should be roughly ~1.375"
   2. Resized case through die should be ~1.383"

I feel like I need to state that you should try to not chop off your fingers when using this jig.  Someone will likely do that so this is your fair warning.  Abide to the safety warnings on the saw, and don't be a dummy.

Edit:  Added a new profile and stl that includes an off ramp for the cut off tips so they eject to the left.  I couldn't get it to be a steep ramp so you may need to help the tips down the slide if they start to stack up.  But this version should prevent the tips from landing in the safety latch hole.  Thanks to @Threeberd for the suggestion.