Step 5: Stabilizing
I decided to enforce the front of the gun with an extra screw, by filling the already existing tube with Milliput and drilling a hole into it, once it was dried.
To give the gun a smooth finish, I used the Milliput to fill the holes, as shown in the pictures.
Mark the middle holes of the connector pieces, by holding them in place with one barrel attached to them. Due to the lack of an angle drill, I drilled the holes, with an 4.2 mm drill by hand (after drilling a smaller hole at an angle).