Just buy a multi sized pack of hex button head bolts mate and pick out what fits, same with the springs...I think I used the brand Ronson off AmazonSorry I have another question. Do you know the size and type of screws used in the build? Also the L bracket do you use only half of it or do you layer them on top of each other?
Support set at 80, pla+ nozzle temperature 235, bed 60, same orientation in your pic with a brim.SO I have run into a little issue - 100% my fault, but In printing the upper receiver, the slot for the bolt handle got screwed up in printing. I printed the receiver with the top laying on the print bed and supports for only what touches the build plate (using cura). Just curious on what your settings are and/or how you print the receiver.