Airsoft Bren 3 MWS GBBR- mostly 3D printed

95% 3d printed GBBR that uses Tokyo Marui MWS magazine, gbb hopup bucking and inner barrel of your choosing.

You can choose between 240mm, 300mm and 450mm inner barrel length. Barrels I used are from Maple leaf.

I measured around 350fps with 0,28g BBs

edit: I added a part for when you need energy max 1J- nozzle_spring_front_under_1J

Assembly video: https://www.youtube.com/watch?v=gh4pasb7wVc&t=1s

BOM:
countersunk screws:
4x M3x30
4x M3x20
4x M3x12
2x M3x8

6x M3x10 setscrew
3x M3x30 imbus head

2x M4x20 countersunk
7x M5x12 countersunk
7x M5 threaded nut

You will also need few M3 threaded rods for reinforcing upper reciever and handguard

Pins and rods:

2mm rods (cut from 2mm TIG wire):
1x 60mm(spring making jig)
1x 30mm
1x 27mm
1x 22mm
1x 18mm
2x 14mm
1x 12mm
2x 8mm
1x 7mm

4mm pins:
1x 40mm(spring making jig)
2x 36mm
1x 20mm

1x 6mm rod 200mm long

3x roller bearing D=8mm d=3mm B=2,5mm

1x O-ring inside diameter 14mm, OD= 19mm, CS= 2,5mm

For springs, you will need: 0,7mm , 0,5mm and 0,3mm hardened spring wire

Parts are correctly oriented, most of them don't need support, but some do, so put support enforcers where it needs to be.

0,2mm layer height
print with PETG, PLA

Print the mag release parts with 0,1mm layer height or choose a slicer settings, that ensures correct dimensions

I strongly recommend printing the nozzle from TPU or other impact resistant material. Also check for shrinking- this part needs quite accurate dimensions.