Material :

2 aluminium tubes : 10 x 210 mm.

1 aluminium tube : 12 x 65 mm.

1 aluminium tube : 12 x 50 mm.

1 aluminium tube : 14 x 44 mm.

1 aluminium tube : 14 x 29 mm.

1 aluminium tube : 16 x 145 mm.

1 aluminium tube : 16 x 120 mm.

2 aluminium tubes : 6 x 26 mm.

1 aluminium tube : 6 x 6 mm.

1 aluminium round : 10 x 8 mm.

1 screw : 3 x 30 mm.

1 threaded rod : 3 x 65 mm.

1 threaded rod : 3 x 70 mm.

3 nuts : 3 mm.

1 small push button.

Advice :

Firsly draw a diagram on a small squares (5 x 5 mm) sheet.

Saw 16 mm tubes (be careful, not completely) only 3/4 of it so that you'll be able to fold them without breaking them.

The slope of the butt is given by a triangle which base is 15 mm long, we will bewel.

Drill a 2,5 mm hole from one end to the other the round to screwtap. (3 mm)

Assemble the trigger guard by screwing the 70 screws (vertical) and the 65 screws (horizontal) and by slipping the 2 aluminium tubes. (6 x 26 mm)

The trigger will give you the measure to drill the tube and put in the small push button at the right place : the button acts as trigger.

The push button makes clickety-clack when you press on it and will be the first assembled when every thing is ready.

Put the 10 mm tubes in the 12 mm ones.

Present the assembly to see the result it can give.

Locate and drill in the 16 mm big tube in a way to make the 2 barrels put on top of each other, cross the butt.

Drilling askew isn't easy. Take your time ! Start with a 3 mm drill then gradually take bigger ones.

If you don't find a 14 mm tube, take a 12 mm one and saw it in half in in the length so that you get a telescopic haft. (anyway, you won't see it afterwards because you use it as a wedge)

Drill the pile of tubes to slide the threaded rod. (3 x 70)

Drill the end of the barrel 5 mm from the edge to fix the 3 x 30 screw and its 6 x 6 mm aluminium tube. (5,5 mm bent wrench)

The screw head will be filed in a reverse V shape to get the line of sight.

To fix the trigger : first put the 65 mm screw and its nuts. (use a pair of tweezers)

Make the 6 x 26 mm tube slide, screw the 10 x 8 round, place the second 6 x 26 mm tube and screwing slide the 70 mm.

Place the nut, stick it, cut the surplus and file in a V shape to get the line of sight.

Option :

The best would have been to slide in the lower barrel a real laser which we find in a few key rings, but the inner diameter of the tube is 8 mm and there's little chance to find a laser this size !

Whatever, the first version is the safest, because go and say to kids to aim at the eyes with a real laser gun !!!