Can i purchase an "80%" receiver?
I've only printed ABS and part of a roll of PETG. ABS is probably too brittle for firearms, I don't even like it in the 10/22 stock. also has issues with shrinkage and warping at receiver (not no mention stock) sizes. My time with PETG was a huge pain to get it to stick to the glass (using hairspray that works fantastic for ABS) but have another surface to print on that was suggested by the Pegasus owner/support guy. It didn't clog in the nozzle but it did catch on something and, being soft, would just strip where the extruder pushes.
I am eager to try this "though" PLA. So far PLA has been great. I have 4 receivers I have tried. One is about to get retired. It has been apart too many times.
I'd like to work with you on the settings if you want. I am going to try a PETG receiver soon. I have used it a bit for brackets and stuff.
You could try the pei sheets. Seems to be the hot new thing.
I'd like to have you work with me on it . It wasn't sticking to glass+hairspray, bed temp 110 (surface temp lower since the sensor's stuck to the bottom of the heat board), print temp 240ish (from memory). I got a heavy sticker print surface from makerfarm that the owner/support guy suggested but my first time printing on it with ABS with bed temp at 110, I think the ABS melted into it because I tore a hole trying to get the failed print off.