I'm not smug. I've printed a bunch of gun stuff. Bed slingers suck to keep running correctly. There are good, inexpensive printers that cost less than updating an Ender or CR10 style printer. 

You NEED to be able to print ABS out of the box. Not so much that you need to print ABS, but you need the hot end to be able to handle prints at at last 260*C for days. 

You NEED to be able to enclose the printer for durable filaments that are very sensitive to humidity and temperature fluctuations. 

You can certainly do that with bedslingers, but it sucks to get them tuned in to print what I consider dimensionally consistent enough to print parts for gun stuff.  

 Okay, I take that back :) 

 Thank you. 

I've been around this space for quite a while. 😅