Here's my files for a DC-15S Blaster. The files are a bit big and might require a larger printer to print, or you could split them in slicer. There also other parts that would do better with SLA, but should come out decent in FDM.

For the front sights you'll want to drill holes and use some 3mm wire or stick that you can bend. I used 3mm filament.

Any 10mm diameter magnets should work for the magazine.

For the body, you should join the sections with 1/2" CPVC

The trigger is designed to flex slightly to press a 6mm tactile button embedded in the grip. This should let you put a simple LED circuit inside.